Posts Tagged ‘digitaleklasse’

afterimage – session 1 “a homage to la jetée”

Wednesday, February 24th, 2010

time and light are keyconcepts for our perception of the world we are living in. when we look at the stars in the nightly sky we seem them glooming bright and alive. but most of the stars we see have already died aeons ago. light, compared to the size of the universe, is slow and needs a long time to travel the far distances from the rims of the universe to our small solar system. what we see is an afterimage of the stars frozen into the firmament. when starring into a bright light source a similiar effect happens. our receptors in the eyes are lamed and cannot receive new input for a short time. so when facing the sun for a certain amount of time and then look away we can still see the bright disc dancing in front of our visual perception. it’s like going backwards into time.

not only light is slow, also our consciouness walks behind reality. when we decide to move an arm, take a step, form a word or just look at something, our subconscious awareness has already made this decision for us. therefore one can say that we live in an afterimage of our subconsciousness. what if anyone is aware of this afterimage, though perceiving the world through the channel of the subconsciousnes. he would be a timetraveller to his
surrounding being one step ahead of our time and space continuum.

the installation is placed in a completly dark room. at one wall a screen is attached that shows altered frames from the movie “La Jetée”, by Chris Marker from 1962. the pictures are not visual on the screen all the time, but flashed onto the retina of the observer. according to the pictures, dialogue lines taken
from the movie sound in the room. the installation tells its own story and though let the movie appear in a new form. because of the fact that the visual part appears different on the retina for every observer a personal interpretation of the story will be given for the visitor.

for more images look here

afterimage 3 – getting close

Wednesday, January 20th, 2010

after some fooling around with methods on how to get done with the technical realization of the project it’s now narrowed down. the installation will use the screen part of an 14” tft monitor, which makes it easy to apply the pictures directly from a pc. furthermore the tft has build in audio speakers which will be used for the sound.

to flash the pictures from the screen onto the retina i’ll be using a photoflash. for the flash to be executed at the right time i am using puredata, which will play the image sequence and sound and is also sending a trigger at the right time to a duemilanove arduino board with an 328 microcontroller chip, which is wired with the photoflash. the script on the arduino is short circuiting the flash to trigger it whenever i say so. by using an optoisolator i’ll be on the safe side not to overload my precious arduino board. thx to riblbem for this wonderfull tutorial!

using pd gives me two advantages. first i can sync the flash with the pictures pretty easy and second i can synchronise the sound to, but still leaving every component discrete though beeing possible to alter them afterwards.

as you can see the setup is pretty simple and so are the scripts, what’s now left to do is to build a decent frame for the tft screen and think about how to attach the flash to it. i also have to find a way how to spread the light of the flash over the whole screen, which maybe works by just putting a sheet of thin paper between the two, but that’s just testing. the tougher part will be now to write the storyline, but that will be the task for next week!

afterimage 2 – installation concept

Thursday, November 26th, 2009

all we are going to do is predefined, not in a spiritual but a subconscious way. our brain already knows when we want to move our hand, go left or right, look at a certain direction or think of something, just an instance before we do it. this scientific fact raises questions about fate and free will. are we free and conscious beings or just slaves of our subconscious mind?
this also questions the structure of time we live in. how can we say to live in the present if our actions and thoughts have already been defined a mere moment ago. as a consequence we have to accept that everything and everyone actually lives and acts in the future, or the subconscious present. therefore all we experience is just an image of the past, an afterimage of ourselves.

what if someone really experiences life in this future frame of time? what if all actions are percepted ahead of time and can’t be undone? this installation tells a story of a man who is trapped in such a twisted form of reallity.

the audio/visual installation consists of a box which has an opening on one side. it’s complety dark inside, a piece of cloth is shading the light coming from the outside. a loudspeaker inside the box is telling the story in a form of an inner monologue. opposite of the opening will be a monitor that flashes pictures according to the storyline. the pictures will only remain for a moment following a dark pause of some seconds. the viewer will see an afterimage of the displayed picture inside the darkness of the box.

I will wake up in a minute. My eyes will open, I will see the light coming through. My dreams will be vanished, my body powered up to full operational mode. All this will happen, already has happened. I still sleep, but I’m already awake….


Saturday, November 14th, 2009

When I was a little kid my mother told me not to stare into the sun. So once when I was six, I did. The doctors didn’t know if my eyes would ever heal. I was terrified, alone in that darkness. Slowly daylight crept in through the bandages, and I could see, but something else had changed inside of me. That day I had my first headache.
qote from the movie pi(1998) by darren aronofsky

everybody knows the optical phenomenon when looking into a bright light source and then close your eyes, you see a phantom image of the shape of the light source. this is called an afterimage. the light receptors in the inside of your eye tend to get tired when exposed to bright light for a certain ammount of time and so can’t react anymore to new inputs. this not only works with your eyes closed but also when you look against a surface with a homogeneous color.

this effect happens due to the complementary color, thou turning black surfaces into white and vice versa. the complentary colors don’t match with the complementaries of the symmetrical color circle. when looking at a color, the brain already expects to see the “aftercolor”, that’s why certain combinations of colors please our eye and certain do not. this color circle is called harmonic. comparing the oppositon of the colors with a regular color circle, you find some differences, for example normally yellow opposes blue, but in this circle its complemantary color is violet.

Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina.
The myth of persistence of vision is the mistaken belief that human perception of motion (brain centered) is the result of persistence of vision (eye centred). The myth was debunked in 1912 by Wertheimer[1] but persists in many citations in many classic and modern film-theory texts.

this is an interesting point for me, because my goal is to use the phenomenon of the afterimage to produce a sequence of pictures thats rolling like a film over your inner eye. for this i will build up a completly dark room, inside a constantly flashing display that should produce the afterimages onto the sight of the viewer.

another possibility would be to develop a system to influence what kind of pictures the visitor of the installation percepts while looking into the light and so guide him through a sequential story with the assistance of correctly timed soundeffects and voice acting, even maybe switch between the dark and lighted modes to inflict drama and to sustain the intended feeling of the storyteller.

now it’s time for research, due to the fact the afterimage actually works only after a certain time of exposure it seems quite impossible to produce a sequence of pictures but that’s the fun to find out…… (more…)

tarantella or i hear fibonacci when i sleep

Sunday, November 8th, 2009

in cooperation with andre wakko


a three steps project assignment by the name “power of 2”, was the starting point for the realization of this piece of work. first step was to produce 32 lines of program code in a language of our choice. by having a keen interest in chaotic and mathematical processes we put our focus on programming a plotter to produce complex shapes seemingly chaotic in the first place but based on the lagged fibonacci generator.


the second step was to use 16 pieces of electronic modules. by using the popular arduino boards and solenoids we developed little objects for producing sequenced rythms by letting the solenoids hitting different objects.


putting it all together in step three, we build up 8 boxes with measurements based on the golden cut. the outcome so far is now a sound installation with the concept of putting a different form of understanding to complex mathematical systems, so letting the listener experience a more subtle type of understanding.

“A little boy closed his eyes before he went to sleep. He thought about his lunch in the school, how the leafs are green and if u look it really close u can see some small veins, like the ones in the neck. He started to count how many of them he can see. 1, 2,1,3 … the numbers start flowting away, dancing in the black sky of his brain, changing colors, going up side down and suddently….one of them starts to make a cintilante sound, like a bell made of a fine glass. The other number got excited and try to imitate or follow the first one. They got lost, and back again, and a strange symphony was making the boy go deeper and deeper in his blackness. He hears Fibonacci when he sleeps.”