This Instructional Activity is a part of the Lesson 12, Unit 5, Grade 7. Enough small cups (disposable bathroom size) are needed for each student to have one. Also, enough colored balls are needed so that each student has four, two of each color. If there is no access to colored balls or blocks, tape a color label on coins. The two colors do not matter. Students need to be able to identify which of two patterns of colors emerge when the cup containing the four balls is shaken.