Illusions, Optical 2008 Desk Calendar

Optical Illusions Desk Calendar: Palm trees that look crooked but stand perfectly straight. Mysterious blue dots that flicker like fireflies. These and the other amazing optical illusions in this 314-illusion calendar.

Escher, M.C. Rational Unreality 2008 Wall Calendar

M.C. Escher Rational Unreality Wall Calendar: With no mathematical background, working on his own, Escher realized principles in his graphics that caught the attention of scientists working in crystallography.

Escher, M.C. 2008 Mini Wall Calendar

M.C. Escher Mini Wall Calendar: Fans of Escher’s perplexing work will find this mini calendar perfect for squeezing into one of the dimensions of their life. Put it right next to the stream that flows uphill or by the staircase up to the basement.

Escher, M.C. 2008 Desk Calendar

M.C. Escher Desk Calendar: It’s hard to say which is more awe-inspiring: Escher’s incredible drawing skill or his fast-and-loose roughhousing with reality. This 2008 desk calendar features 262 weekday pages-each with a classically befuddling Escher image.