1.   In classifying the aim is to sort objects by their selected properties into homogeneous categories.

2.   Sometimes the objects can be sorted by asking one question.

3.   The objects will be sorted by their shapes, colors, locations, brightnesses, approximate distances and other qualities.

4.   Why should African objects be sorted into our grids?

5.   Someone watching a highway, for instance, can sort distinct objects like a police cruiser and perceive changes in direction, speed and color.