Landscape afterimage-buff

Yi-Ting Su

2023

acrylic, Rayon, silk, paper pulp on canvas

Sold

Description

藝術家蘇誼亭

關於 isart gallery 御書房藝廊

Recommend Artwork

Exhibiting
Night Moon Tree Child
The Dance of Summer
建築符碼
HE4033
Insecure Dog / Turquoise Blue
Daydream
Empire State
Sold
Manhole
Little Witch's Forest
Becoming 2
Sold
Mom and me
Mother- Tongue Lashed
Las leyes naturales
Sold
Lovers in the French Movie
Dinosaur / Whitey purple and Pink
Dancer: Selina #8
Sold
Fallen Leaves and Root
Sold
Berry Full and Round
MT3003
Fake life, beautiful hypocrisy
MONICA
Exhibiting
Manganese ore silver green tree child
Sold
My pals No.10
Sold
Gradually
Sold
Shanguang Stacked Berries
Sold
Harvest Full of Berries
Send a flower
春遇 - 1
迥迴
BETTY
Code Couleur 5
Dancer: Flora #4
Adventure
Exhibiting
sleepwalking
Sold
Decade 2022-49-1
The place of the soul
Little Scenery of the Valley Stream
Espace Affine 8
Nuan Nuan Leopard-Night
Núcleo
春望
風吹起時的飄盪 - 貝拉
風吹起時的飄盪 - 愛得萊爾
Words Recovered 10
Sold
Daily to Generation
Embracing Myself
Sold
A Forest Made of Strawberries
By My Side
Sold
song of the heart
warmth
Summer
Into You
Mass of Feeling
Exhibiting
Little Tree Forest
Sold
Decade 2022-34-6
Sold
Lazzy Girl
Blossoms Taiwan
Aspri Limni Tide
Levant Wind
Exhibiting
Moonlit Tree Child
Flow - 9
LILLY NO 5
Copper Wire Flooring: The Sketching of fiower. 08
Sold
iris
Every Berry Has You
poppy flower
Seeking light 65
Antarctic Ice
Kolkata Sky
Dinosaur / Yellow and Turquoise blue
Sold Exhibiting
Mori's moving cat
Above the clouds #1
Resilience- Dancer: Beryl #44
Sold
Running towards hope that opens up infinite possibilities
Exhibiting
Condensed Tree Child
Nightjar
Jumeirah Tide
Daily to Generation
可延續性的空間
Sold
My pals No.3
New Mythology for a New Century - Ai Trilogy Gaia
Sold
Infinite Mountain - 1
Sold
Strawberriers 1
Sold
Strawberriers 5
風吹起時的飄盪 - 艾比芮爾
Dancer: Gama #0
Sold
3D Dogs that reflect you / Pink color
Sold
Mondes à venir 6
Exhibiting
Then I met you
Dancer: Flora #8
Manua Loa Air
Sold
Carry me No.3
Sold
Layers of Strawberry Joy
Stay on the mind
Exhibiting
My butter dream
The Dance of Autumn
Sold
Enchanting Berry Whirl
Strawberry Joy Everywhere
Réjouie
miss
El refugio
My Little Helper
Daily to Generation
Sold
Reading the newspaper is a kind of fashion
daily commemoration - my room
Melt With You
Exhibiting
Ryemyo
La Mer Tide
Dancer: Gama #2
World-Honored One
Sold
Strawberries Leaf
Sold
WP (LAN6)
秀姑巒溪裡的石頭
Los gigantes
Sold
Friends' Paw Pals No.3
Resilience- Em #7
春光
Narcissus
Dancer: Flora #5
A night party in 2059
Ouverte 2
Whispers in Dreams
A Forest Made of Strawberries
Dancer: Flora #3
Exhibiting
Bluedream
Secret Garden
The One Who Follows You
Sold
Every bite of strawberry is sweet
Sold
Urban life-31
Dancer: Gama #3
貓頭鷹團員
Dancer: Jade #2
Sold
cell division - 6
RN8007
2021 Epidemic Trifecta - 2021 Taiwan Chronicle - A Song of Ice and Fire
The shuttle bus is waiting for you
Sold
생각하는 사람 Thinker
Above the clouds #9
3D Dogs that re-flect you / White and Blue
Sold
Daily to Generation
Sold
Pollia japonica Thunb and butterfly
Urban life-28
Being a beam of light
Nuannuan
a little bit of luck
Holding Something Gentle
Milos Water
Sold
Daily to Generation
Sold
Cherish each other
遊蕩
Lend a Hand
Sold
Let’s take a picture
Scenery Within and Beyond the Wall
校園裡的樹
Longyearbyen Warming
Dogs that reflect you / Whitey pink and Light gray
PENELOPE
The Washing Machine of Life
Biodiversité étude2
TRIA NO 4
Process
Wavelengths_2316-2
Sold
WP (landscape)
MARILYN FROM A PARALLEL DIMENSION NO 2
DISH
FOX
Sold
Get together
Sold
Green Untie
Sold
La primavera
Always want to make a smile / Whitey pink and Whitey yellow
Message Embedding - 1
Coexist
TAMARA NO 3
Point final
Sold
Mondes à venir 5
Daily to Generation
Infinite Longevity and Light
Maldives Tide
Exhibiting
SERIES: 이 도시 어딘가에서
Dancer: Flora #1
Resilience- Halo #7
Sold
Big berry
Red (Sea Rising)
Sold
cell division - 2
My pals No.1
Sold
Get What You Want
Sold
小花 2
The Magic Mushroom
Sold
Dogs that reflect you / Whitey green and White
Sold
infinite mountain - 5
Infinite Mountain - 6
向晚森林
Dancer: Juan #2
Dinosaur / Yellow and Whitey purple leopard
2021 Epidemic Trifecta - Taipei Fashion Month
The Tree That Embraces the Light
Leisurely Travel with the Light 5
Irassyaimase No.2
The Permanent Garden - 77
Love and Peace
Skeletal studies 2
El secreto de las flores
dew of flowers
2021 Epidemic Trifecta - Don't Hear, Don't See, Don't Speak
Daily to Generation
Mixed Emotions / Cats / Whitey gray flowers and Gray color
Ponctuation
Sold
Berry Whispers
Sold
Infinite Mountain - 7
Sold
warm poetry
Hey! Love
Sold
Decade SQ 2023-34-6
Missing moment
Calm Days 13
Frágil
Seedling
The Four-Dimensional Realm - 3
Daily to Generation
Flow - 7
Exhibiting
Matcha Mountain Breeze Blowing Tree Child Series 2
舞動的雲
Sold
Landscape afterimage-green
Sold
Romantic Flower Like Strawberry
La iluminación (La muerte del ego)
Green-Leaved Doors and Windows
方宅 (2)
Exhibiting
Letter from Light
Sold
warm little pillow
Tag
DAVID FROM PARALLEL EARTH
粉飾
Exhibiting
Blue rooms
Monk in the Snow
Blue, Bluest
Puzzle / Dogs / Sky blue and Colors
Twin Cities: Light
Peaches I
Serious Cereal
Dancer: Juan #3
Espace Affine 9
風吹起時的飄盪 - 愛達琳
Routine
Make Friends with our’s eyes
Huh! Photograph
Copper Wire Flooring: The Sketching of fiower. 07
Sold
Calm Days 9
Sold
My pals No.2
Sold
Lily
shoot the sun
Daily to Generation
Sculpted silhouette
Sold
Good Night
Daily to Generation
粉與綠的彎曲
EILEX
Green-Leaved Doors and Windows
Portrait in Black and Silver
Samantha-1 in the Eternal Garden
EUGENIA
Sold
Strawberry Mountain in Spring
Exhibiting
Fuji Tree Child Series 2
happy lovely
Peach Buzz
Sold
We are the same
MARILYN FROM A PARALLEL EARTH NO 1
Cambridge Air
Sold
Kuaizi Etiquette
Living in the Rhythm
街燈上的交疊
Exhibiting
Matcha Mountain Breeze Blowing Tree Child Series 1
Exhibiting
The forest did not sleep tonight
Exhibiting
HYTTE
CECILIE
Sold
Urban life-31Urban life-32
A Beautiful Garden of Berries
Sold
Message Embedding - 5
Dancer: Juan #9
The bookstore is the place I visit most often
Hormonal Bloom: A Symphony of Growth and Emotion no.3
Infinite Mountain - 11
Wavelengths_respect5!_052
Sold
Taiwan Pyrola
Falling Like This
Sold
Mixed Emotions / Cats / Skyblue flowers and Pink color
Espace affine10
Where Days Slowly Sweeten
Exhibiting
Fuji Tree Child Series 1
春之宴
Empty
Kuaui Sky
有鳥的院子
Long Live Peace
Templo(Giclée Print-50)
Deep Puzzle / Sky blue
Cosmic Consciousness-1
Sold
The rest of the time I arranged properly
Curious Human
Sweetest Things
at this moment
Twin Cities: Rain
Sold
TP (2022_12)
HE4034
Dancer: Juan #10
Exhibiting
Human Remains 2
Sold
Blade Unfold
Two Monkeys and a Pine
message accumulation
Sold
Cycle Whirl 2022-49-1
CALLIOPE
A morning feast in 2059
遐迩
Give And Take / Whitey Yellow and Colorful
El despertar
Sold
SZ8001
Flashbacks: Red Lines
Sold
Cute Moment
Resilience- Halo #12
Resilience- Dancer: Beryl #0.1
Sold
Rainy - 1
Une voix
Exhibiting
SERIES: KITSATEN: shining day
Sold
小清新 7-3
Sold
Happiness in the Making
Sold
Etoile augmentée
ALCYONE
Above the clouds #26
A Little Strawberry Paradise
My First Blue Greeting
Dancer: Flora #6
Give And Take / Whitey pearl and Colorful
A Shelter for the Light
Code Couleur 4
春見 - 2
PADME
Sold
Absent Presence
A Season of Joy, Gratitude and Hope
Slowly slow
morning glory
Exhibiting
Green Joy Tree Child
Mass of Feeling
cell division - 7
Sold
immortalization - 2
déjà vu
Sold
WP (LAN5)
大蘋果
The days can make people feel long and short at the same time
Sold
My pals No.9
Sold
Work I
Everywhere
Sold
cell division - 4
Vanilla Sky
Clean Energy Echo
El refugio
Ubran Forest-2
The Color of Our Evening
Calligraphing en l'air #1
Shaolin Master #2
Sold
Blueroom
Sold
Daily to Generation
ELVIS FROM PARALLEL EARTH
Sold
3D Dogs that reflect you / Sky blue and Pink
Ever since I learned to think back, I have never been bored again
Stenochlaena Fern and the Pangolin
The Warmth of Winter
Summer Lotus
Rights Games
Sold
Urban life-33
A Seat in the Inner Room: Nurturing Memories
邁步向前行
Sold
Mass of Feeling
感性被理性借宿
Sold
Real berries
海岸山脈起點
Sold
My Happy Place
Sold
Daily to Generation
Sold
Los espirtus del bosque
Sold
It's still fun to hear others talking about themselves
Sold
Mugwort
Sold
Urban life - 21
Push The Sky Away
Mass of Feeling
Blooms of Happiness
Sold
Shining Day
Flow - 6
Exhibiting
Breeze Tree Child
Words Recovered 04
Tongtian Road
Words Recovered 09
Calm Days 7
Exhibiting
FURUCAFE
It's unfair!
A Beautiful New World
Gwathmey Siegel BLACK
MARLENE NO 2
Dancer: Juan #4
A desk needs to be big to be practica
Fluffy Blanket
Sold
There is you on the path to happiness 40-1
I’ve loved reading since childhood
Resilience- Halo #2
Beautiful Interference
CELESTINE NO 5
The Monk Under the Moon
Sound of the Tide
Sold
Finewater roasting
Words Recovered 06
GALEIA NO 3
Winter Cold
CRESSIDA
Sold
night starry
Sold
p75
Everyday Sunshine
Party Animals
Sold
1/1206 seconds
Sold
Strawberriers 2
Sold
WTP (2022_16)
Emotional Series - Happy
Berry Full of Love
Sold
Woodland Bunny
Ouverte 1
Exhibiting
The wind will guide us to the way
Berries Together in Heart
Sold
Urban life-27
La porción áurea
Dancer: Selina #13
Sold
Decade 2022-26-5
HE4031
Let it go
Play hide-and-seek
The Study Two Years After Moving
Lay Me Down
Balloon #6
Exhibiting
Ringring in tinan
Gradually melting people
Dogs that reflect you / Dogs / Green and Gold
Sold
日常 2021-7-1
MT3005
Exhibiting
Azuky
I Can Show You The World
Work  III
Makua Tide
Daily to Generation
Honey Source
Exhibiting
Moon-Reflecting Tree Child
Empathy
Skeletal studies 1
Rubin’s Vase
Endless Becoming
Sold
Kind of Miss You
Sold
A Warm Cloud
Sold
3D Dogs that re-flect you / Sky blue and Yellow
Bro
Daily to Generation
SOREN
Exhibiting
Green Moss Lake Tree Child
Sold
Seriously Good Cereal (series 1)
Spring Banquet
cuteness of youth
HE4029
Miss the feeling of flying
Spring Stroll
Where Light Decides to Stay
3D Dogs that re-flect you / Yel-low and Pink
Azaleas in Full Bloom
Urban life-65
在小欒樹下
Aqaba Tide
capillary phenomenon - 1
Sold
Resting with the Moon and Stars
Balloon #20
Sold
Decade 2022-42-4
Mixed Emotions / Cats / Gray and Black
阿黛莉娜金
The Green Cafe
Urban Landscape
MARLENE NO 1
The Night’s Gentle Invitation
have a snack
Sold
Turkish Tea Set
pansy garden
Mixed Emotions / Cats / Sky blue and Orange color
Exhibiting
Little Tree Beast Forest
Sold
A Breath Within the City
Sold
Decade 2022-81-1
Frame
產生一個可移動的集結
Sold
Time Tunnel
Sold
Berry Trail
Sold
1/517seconds
Sold
Urban life - 22
Shaolin Master #4
Sold
You Are My Favorite II
together
Sold
arc
Sold
Yellow Scarf Owl
Sold
WP-2021
Freedom, Equality, Fraternity
100,000 miles of road with the stars and moon, 70 years of fame and dreams
Ícaro
山中小路
色彩的序列
Everywhere
Copper Wire Flooring: The Sketching of fiower.10
Paysage Mathématique
The Bookroom of the Journey
Sold
Planet - Venus #1
Sold
Companioship
風吹起時的飄盪 - 愛琳森
Exhibiting
Analogue
MT3004
Sold
Urban life-25
Sold
Close up / Cats / Turquoise blue flowers and Pink color
Sold
Urban life-29
Passion
New Mythology for the New Century - Ai Trilogy Nuwa
REM
Happy in Berries
Flashbacks: Blue Lines
Magnolia
Sold
3D Dogs that reflect you / Purple and Fluorescent pink
Stuck/Undone
ROSE NO 3
This is me
Tianlong Temple Landscape
2022 Fuhu Shengfeng under the epidemic
Exhibiting
Lake Sleeping Tree Child
P76-1
Sold
The Day in Shousha
Respiration
Calligraphing en l'air #2
Sold
Dogs that reflect you/ Shaped/ Blue and Lame pink
Lunar Radiance
Flow - 8
Sold
Slide
Vacation Time 8
Sold
몽상 Daydream
Sold
Ring of Time
Sold
Gentle Sunday
I just slipped out for a bit
Dancer: Selina #16
In Each Other s Company
Sold
cell division - 8
New Mythology for the New Century - Ai Trilogy Eve
The Dance of Winter
Strawberriers 4
Linjiang Pavilion
Sold
I like you
Exhibiting
Human Remains
Dogs that reflect you / Whitey pink and Pastel colors
Dancer: Flora #2
Kuaizi Etiquette
Sold
Decade 2023-26-1
Sold
雀躍 2020 26-1
Safari Pyramid
Sold
As Days Go By 2
War and Peace - Angry Athena
Exhibiting
Forest Island
Sold
Mixed Emotions / Cats / Whitey Pearl and Gold color
Berry Heart in Bloom
迂行 - 1
Sold
Templo
The Way With You
New York to Change
Reflecting Tomorrow
Sold
Rencontre
風吹起時的飄盪 - 艾倫
Sold
cute flower
Dancer: Flora #7
Architecture
Interwoven Existence
Emotional Series - Unhappy
Sold
Carry me No.2
Pressed, Yet Alive
The Light in the Heart
初行
迓春
Sold
Reading Time In An Old House
Sold
Calm Days 11
Sold
Message Embedding - 2
Flow - 5
Mirror in Strange Times
客人來了
La danza, el bardo
Infinite Mountain - 10
MARILYN FROM A PARALLEL DIMENSION NO 1
War and Peace - The Peaceful Eriné
Sold
6.22 seconds
Resilience- Em #1
A luncheon in 2059
Prendre Corps étude 2
Writing you a litter
Sold
WP (LAN2)
Three wishes for each year
Daily to Generation
Sweet Potato Leaves
Sold
Pile up
Sold
cell division - 2
Care for Abused Children
A Drowsy Pause: Light on the Shaded Water
Vacation Time 5
action
Above the clouds #3
The Self
Exhibiting
Let me here
Code Couleur 3
Sold
Blessings of Nigella
FAE NO 2
Joy of the Universe
Exhibiting
Bird in suwon
Sold
Home of Heart
Together, Like Berries
DINA
Heavy Glow (Blue)
Whenever you're ready to talk
Empty Silence
Espace Affine 6
高高的鳳凰木
Puzzle / Cats / Light purple and Rose pink color
The Finnish Early Summer
Mixed Emotions / Cats / Whitey Pink color and White
Destiny
The one who brings good news in the winter
Daily to Generation
The Evergreen Pine
Espace Affine 12
Begonia
DX1001
Sold
Daily to Generation
Suspiros #1
Sold
Caring
A fleeting sparkle
SANDWICH
迂行 - 3
方宅 (3)
春見 - 1
One Leaf Heralds AutumnX3
BUNNY NO1
Sold
Together
金色符碼
Sold
Mountains of Strawberries
Double Talk
Dancer: Juan #12
When We Collide
Copper Wire Flooring: The Sketching of fiower. 09
Code Couleur 2
Sold
Top of the Morning
CHARLINE
Dream Walker
Berry Mutual Love
Sold
Strawberry Aroma
3D Mixed Emo-tions/Dogs/Pink and Gold
Home of the Dragon
Sun, Moon, Black, White, Male, Female, The Circle of Life
Sold
Platycodon
Read a book, have a cup of tea
Sold
The Best of Days 1
Sold
Surprise at the corner
Resilience- Halo #3
Sold
New Leaf
Send you a flower of love
Landscape afterimage-blue
Sold
Everywhere
Sold
Myosotis sylvatica
Puzzle / Dogs / Light purple and Yellow colors
Rewrite The History
Sold
防疫期間限定 - 社交距離
Turkish Tea Set
Sold
Urban life-30
In the depths of darkness
World Skies Purple Sunset
Sold
The shining of the mind
LILLY NO 3
Exhibiting
Wind Blows Tree Children Forest Group
The Perfect Spot
Sold
Inter-Symbiosis
Jardin 2
Sold
Blissful Moments
Puente
Mise au point
藍色夕陽
The process was too rushed and too precise to leave much trace in my memory
Resilience- Dancer: Isabella #4
Lean On Me
Ninni
SHADIA NO 4
Shaolin Master #1
Sublimation of Samanta-14
Exhibiting
SERIES: a windy summer day
A Forest’s Embrace
Sweetly Together
方宅 (4)
Sold
Berry Bloom
Soft Collection
Pink Shirt
紅與綠相交涉
Morphogénèse
遊春 - 1
Snow Leopard
Butterfly in love with flowers
Exhibiting
Day-day
Coexisting with A-Zhi
Sold
Berry joy
Leisurely Clouds and a Lone Bird
Sold
Close up / Cats / Yellow and colorful
Sold Exhibiting
Waiting for the Moon Tree Child
Dancer: Juan #6
The Road
Sold
WP (LAN3)
Sold
So Gently Strawberry
LYLAH
in disguise
TAMARA
Sold
Urban life-26
Daily to Generation
Sold
warm snow
Rocky Mountain Air
Sold
A room of various angles
Sold
Win-win
Sold
Swim and Be Happy
On the White Lotus Throne
Berry Lovely
Sold
Blossoming Berries
Sold
Where the Heart Begins
Sold
Calm Days 1
Nuan Nuan Leopard-Dusk
Source
The Hill of Strawberry Dreams
La conquista del ego (I)
Code Couleur 6
Vitality-2
HARLOW
MANE
the countryside of Meinong
The Red Nosed Reindeer
Solar Illusion 2
藍花
Ambiguous things
Copper Wire Flooring: The Sketching of fiower. 06
Sold
WP (figure)
Small Boat and Fisherman's Hideaway
針灸光影
Espora
ROSE NO 4
Sold
Period of prosperity 120-1
Mares
Pandemic Period Limited — Gathering
Prendre Corps étude 5
Panorama
Norme aléatoire
Puzzle / Dogs / Blue and Yellow colors
Rainy - 2
Sold
金山 2021-34-1
Resilience- Dancer: Isabella #6
DX1002
Période
Genisys
Sold
WP (LAN2)
Star, Tree And River
Bang
Resilience- Dancer: Beryl #41
Sold
windy place
Sold
Miss you
tulip
Shade and light
"As Evening Falls, the Sky Begins to Snow" "A Quiet Night Listening to the Snow"
Blue Monday
Clean Break (Two Sides of Our Story)
Sold
Strawberriers 3
Mute
Sold
Wonderful Encounter
Dancer: Isabella M #1
Congo Sky
Sold
deep love
By the Window
Sold
Urban life-20
Soften
Instants T2
Berry Happy Moments
風吹起時的飄盪 - 愛得羅德
Sold
6.27 seconds
迂行 - 2
ES023
MT3002
Be my shadow
Exhibiting
Wait
Dedication to Self - 2
Thoughts, Memories, and Wishes from Last Spring
Vida
Totally at Peace
Resilience- Dancer: Beryl #0.5
Sold
cell division - 1
LARINA
ATHENAIS
MT3001
The Dance of Spring
Sold
Dogs that reflect you / Red and Yellow
Sold
Urban life-23
方宅 (1)
Exhibiting
Dream Tree Child
Red (Six Hurdles)
Heavy Glow (Red)
Sold
BFF
Balloon #5
Vuelta por el universo
In the valley
The Nicest Thing
Mood Diary
the power of light
Sold
Blissful Moments IV
Sydney Warming Sea
Ecart
Exhibiting
Haisonghu Tree Child
moment of love
Daydream
The Quiet Universe
Echoes of Joy: A Visual Translation of Happiness no.5​
Gate of Spring
Sold
Time Out II
Sold
Born by Berry
Jardin 1
The Temptation
PLEIADES NO 3
Nuannuan Leopard-Early Morning
Flow - 10
ELVIS FROM A PARALLEL DIMENSION NO 1
Mood Diary
Fragonard's Decapitated Forest God
Buttercup and Butterfly
Cosmic Energy Illusion
Reading Air
I’ll Be Your Mirror
春遇 - 3
Thirty thousand volumes in the collection
Parabhakti-3
春遇 - 2
Words Recovered 07
my friend
Gentle Berry Days
Sold
Visually Delightful Roselle
Daily to Generation
遊春 - 2
Exhibiting
Cute Yellow Tree Child
Crawl
In a State of Ease
Vitality-1
Becoming1
OLETTE
Sold
immortalization - 1
Everlasting Garden-67
Sold
Mass of Feeling
Sold
Puzzle/ Whitey pink
cell division - 5
Holding Onto Strawberry Joy
Sold
Ｍountain Strawberry
Exhibiting
Starry Tree Child
Solar Illusion - 1
daily commemoration - storage room
Sold
Carry me No.4
Encounter-2
Blue Moon
El renacimiento
Exhibiting
Oshino Hakkai Tree Child
Sold
2.24 seconds
Where Are You?
Wavelengths_2316-3
Coordonnées
work IV
Berry Beautiful Feast
Sold
Decade 2023-81-1
Exhibiting
Slow down tonight
Stenochlaena Fern and the Pangolin
Sold
Storeroom
Sold
First love
Resilience- Halo #6
Sold
Accompanied by flowers
supersaturated
Zone
FONTANA
Sold
And Never Have I Felt so Deeply at One And the Same Time. So Detached From Myself and so Present in the World
Sold
Message Embedding - 6
Night Rain in Bashan
Sold
몽상 Daydream
Jardins 3
Daily to Generation
Sold
Urban life-24
Pray
老屋與樹
What’s The Time Now, Mr Fox?
方宅 (5)
Exhibiting
Human Remains 3
Sold
Samahdi-53
Fun Nice
Dancer: Isabella M #3
Sold
WP (LAN4)
交盪出的中介
Harmony, Equal and Care
/
Back To List
TOP
Installment Plan