Here is another set of small optical illusion and visual perception related images you can link to from your own website / profile page.
Pic #21 of 25(back to thumbnails)
The Zollner illusion enhanced by size-constancy effects. Where long lines flank convex step edges both illusions co-operate, so the lines seem to diverge with distance. Where lines flank concave edges the illusions conflict and the long lines appear parallel.
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In case you missed them you can still see the second perception pictures as well as the first set of illusion pictures.
i dont understand
Me neither