I made this project without trigonometry, variables and lists. I used nine sprites... It is based on my project - Varignon's Theorem http://scratch.mit.edu/projects/dapontes/1493762 "Varignon's theorem is a statement in Euclidean geometry by Pierre Varignon that was first published in 1731. It deals with the construction of a particular parallelogram (Varignon parallelogram) from an arbitrary quadrangle. The midpoints of the sides of an arbitrary quadrangle form a parallelogram". (from wikipedia http://en.wikipedia.org/wiki/Varignon%27s_theorem The music is composed by a Greek musician, Yiannis Kassetas (album FUNKABYSS). Thanks Wes64 for the idea http://scratch.mit.edu/projects/Wes64/2708708