TESSELLATION: USING A SLIDE
Slide each "bump" on the first square to the opposite side of the square so that it becomes an "indentation" in the square (it will also become a "bump" on the next square). Continue the process until each square has two "bumps" and two "indentations." Use your imagination to see if you can find a hidden picture in the design (coloring your design is more interesting when you alternate colors).