Applications of Finite Projective Planes

Question

Can someone point me towards some applications of finite projective planes that are approachable without too much background knowledge? So far, I have vector spaces, Latin Squares, and Sudoku, but I was wondering if there were any others?

Answer 1

Finite projective planes are a special kind of block design: http://en.wikipedia.org/wiki/Block_design Block designs, and in particular finite projective planes, can be used in the part of statistics which deals with design of experiments.