The main purpose of the Colour Box is to develop a child's visual sense of colour. Primary colours (Red, Yellow and Blue) are introduced in Colour Box 1, which is first presented to a child at 2.5 to 3 years of age. Colour Boxes 2 and 3 add more tablets to the mix, expanding a child's colour knowledge.

Color Box 3 is a large wooden box in the Sensorial Area, containing 63 color tablets: gradation sets of 7 tablets of each of the following colors, blue, red, yellow, green, orange, purple, grey (including white and black), brown, and pink. This material is presented after success with Color Box 2.

The Color box at the right of the window displays the currently selected foreground and background colors. The top color is the foreground (for drawing with left-click) and the bottom color is the background (for drawing with right-click with most tools).