- 15 July 1999 : Ralf
- Hi Catherine, I found your page asking altavista for "impossible window".
I'm a psychologist who is interested in spatial perception. For my experiments I used the impossible window, which regrettably is different from the one in your collection of Oscar Reutersvärd. (By the way, the pictures are beautiful.)
You seem to be an expert on that impossible figures. That's why I dare to ask whether you know the author of the impossible window of which I have a very poor variant on my homepage. The only reference I have is that it was published anonymously in "Aviation Week and Space Technology" on the 23rd of March, 1964 (haven't seen that myself).
It would be nice to here from you.
Ralf Goertz - Institute for Psychology
- 19 July 1999 : Ralf
- Hi Catherine, thanks for your answer. The howto for the four-bar is very interesting. Actually, the picture on my homepage is made differently (less clever). As I told you I am interested in spatial perception, and in our experiments subjects have to decide on the structural possibility of simple line drawings. We assume that this task is more easily performed by the right hemisphere of the brain.
But for these experiments we need a reference condition, that's why more complex stimuli are excluded. In our case the reference condition is the question: "Is the figure triangular or quadrangular?" So we use 4 different kinds of stimuli. I have attached them (hope you don't mind). The impossible quadrangle we used first (as seen in the attachment) seemed to be the natural extension of the Penrose triangle. But this stimulus was very different from the others so that is was too easily distinguishable. That's why we tried the four-bar. By the way, the stimuli are deliberately distorted. Each time the subject is presented with a stimulus it is a different representative of one of the four classes (the regularly shaped prototype is rotated, sometimes mirrored, and stretched).
Thanks also for the references, I try to find the books here.