Create an optical illusion using the brush and paint bucket tools. To draw straight lines, use the Shift key when painting. To help align things, show the ruler or grid.
Example Optical Illusions
Steps to Create an Optical Illusion
1 Draw a simple grid like this.
2. Draw a pattern inside the grid.
3 Fill in grid with alternating colors using the paint bucket tool. Black and white looks the best, but it may be difficult to fix if you mess up. You can only undo so many times.