In a puzzle, the solver is expected to put pieces together in a logical way, in order to arrive at the correct solution. The solver can distinguish differences in line length, shape, orientation, distances and color readily without significant processing effort.

Some works of fiction have mentioned fictional colors outside of the normal human visual spectrum that have not been observed yet, and whose observation may require advanced technology, different physics or magic.

An impossible puzzle is a puzzle that cannot be resolved, either due to lack of sufficient information, or any number of logical impossibilities.

The three components could yield up to seven different forms of love. The color wheel theory of love defines three primary, three secondary and nine tertiary love styles, describing them in terms of the traditional color wheel.

Information can be thought of as the resolution of uncertainty. Graphical displays should avoid distorting what the data has to say and make large data sets coherent.

Behold the Lamb who takes away the sin of the world.