Mondrian Compostion With JavaScript

This website is amazing:

It’s an interactive work based on artist Piet Mondrian’s “Composition with Yellow, Red, Black, Blue and Grey” (1920). It allows everybody deconstruct the original painting and form it again in whatever he or she wants. Lines are shiftable (just drag it with your mouse) and colors changeable (click on it). Texture of the painting was preserved for authentic look.

You can play with composition, forms and colors, alter the harmony of the piece or even destroy it and compose something pictorial.