In the pictures of The Wright 3 there are hidden fish which we figured out that the number of fish has a direct connection with fibonacci. The number of fish hidden are equal to the chapter number. But, the fish are only hidden on a chapter whose number is a fibonacci number. This picture was taken from chapter 21, which is the 8th fibonacci number. You can see how well Brett Helquist hid the fish as hair, shirt creases and bushes. We've outlined them in black ink.
Image: From Balliett, Blue. The Wright 3 New York: Scholastic, 2006.