How to Look at Mondrian
huffingtonpost.com
huffingtonpost.com
Mondrian's work is generally considered to be hard to copy due to the subtle balances of color and form, not technique. Simplicity arrived at as an end point does not correlate to a simple approach in the beginning.
(I wouldn't claim this, as its easier to copy something once it's already done.)
The work of a bathroom tiler, maybe.