Wondering about whether this is really optical illusion or what I’m seeing is just an illusion. :v
I did this on white paper then drew some patterns to aim the “optical illusion” and then give the black color. To finish it, I attached that already-done-paper to ‘impraboard’ which color is black.
Somehow I can feel something like illusion on the picture. But, I hope it doesn’t only me. Do you feel it too?