Keywords: Benary Cross.svg Benary cross an optical illusion found by w Wilhelm Benary The triangle in the corner of the cross appears darker than the triangle on the cross although both are of the same shade of gray and have the same shades of gray at their boundaries thus it's not a case of w lateral inhibition The effect is explained by the so-called belongingness One triangle belongs to the cross while the other belongs to the background on which it appears darker own 2011-01-09 IdS PD-shape Cc-zero ImageNote 1 384 174 8 8 569 569 2 This triangle appears darker ImageNoteEnd 1 ImageNote 2 108 222 74 44 569 569 2 This triangle appears brighter ImageNoteEnd 2 Contrast illusions Crosses Gray and white |