Which avocado has the pit?



Which avocado has the pit removed?

If you said the left one, your are correct. However, if you said the right one you would also be correct.

The left and right images are identical except that one is rotated 180 degrees with respect to the other.

Consequently, whether you perceive a depression or a mound depends on your assumption of where the light is coming from.

Fun Things
Table of Contents
Subject Index
Table of Contents [When not using frames]