i just read the awesome link posted by fresco
Here it is
Quote:The figure was later altered and adapted by others, including the two psychologists, R. W. Leeper and E. G. Boring who described the figure and made it famous within psychological circles in 1930. It has often been referred to as the "Boring figure."
Versions of the figure proved to be popular and the image was frequently reprinted; however, perceptual biases started to occur in the image, unbeknownst to the plagerizing artists (Craven: That would be me) and psychologists who were reprinting the images. Variations have appeared in the literature that unintentionally are biased to favor one interpretation or another, which defeats its original purpose as a truly ambiguous figure.
In the three versions shown above, can you tell which one is biased toward the young girl, the old woman?
I'd say the top one is well balanced.
The lower left one biased toward the young girl and the lower right one biased toward the older woman.
What about mine? The challenge posed to me when I copied it was to determine what lines altered the bias.
