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In above figure, which constitutes a modified version of the painting Tirets by Francois Morellet, small circles seem to appear and disappear as the eye is moved over them.

A strange loop is a phenomenon in which, whenever movement is made upwards or downwards through the levels of some hierarchical system, the system unexpectedly arrives back ...

The Season 1 episode "Sacrifice" (2005) of the television crime drama NUMB3RS mentions econometrics.

The encrypted form of a plaintext.

A cryptarithmetic in which digits are used to represent other digits.

Combine the two above squares on the left into the single large square on the right.

A long division in which most or all of the digits are replaced by a symbol (usually asterisks) to form a cryptarithmetic.

The quantity twelve (12) is sometimes known as a dozen. It is in turn one twelfth of a gross. Base-12 is known as duodecimal. The Schoolhouse Rock segment "Little Twelvetoes" ...

A Greek cross, also called a square cross, is a cross in the shape of a plus sign. It is a non-regular dodecagon. A square cross appears on the flag of Switzerland, and also ...

An impossible figure in which a stairway in the shape of a square appears to circulate indefinitely while still possessing normal steps (Penrose and Penrose 1958). The Dutch ...