The space on the right is reserved for a greatly expanded picture of the unit square, which can be designed pixel by pixel. The tools shown along the left edge of the screen are the standard Macintosh drawing tools — the pencil (for changing individual pixels), the paint bucket (for filling in entire areas), the eraser, the line-draw tool, and two kinds of rectangle-drawing options, filled and unfilled. Various kinds of shading are also available. Another option superimposes a rectangular grid as an aid to drawing.
Once the child has created a unit square, he clicks "Done"; the program immediately goes to the screen on which the quilt will now be built. The unit square that was just created is reproduced on this screen, along with three sets of arrows. Initially, all the arrows are pointing up, as in the figure below.
The user can click on any arrow at any time; each click rotates the arrow 90° counterclockwise. When the child wants to construct the 2 × 2 design, he clicks on the box under the first configuration of arrows. Immediately the 2 × 2 pattern is created.