Find the regularity

Describe the patterns in the following examples. What is the reason for these patterns?

A line of footprints on the seashore.

Footprints in the sand.
Source: Ajith Kumar. Licensed under a Creative-Commons Attribution 2.0 Generic (CC BY 2.0).

A ladder leaning against the outside wall of a house.

A ladder.


Jane made the following drawing and said there was a pattern in it. But her teacher could not see the pattern. Can you?

A child’s drawing of an apparently random assortment of multicoloured circles, stars, and stars within circles.

Jane’s drawing.


When you have finished puzzling over these questions, look at some explanations in Explaining Regularities.