"I will certainly include among those precepts a new method of speculation, although it may seem least, and almost
laughable, it is nevertheless a very useful tool in raising the intellect capacity for invention, here it is:
If you look at certain spots smeared walls, made of various mixtures of stones, you can see the invention, and the similarity
with various landscapes, various battles, ready-made characters scenes, strange faces expressions , and costumes, and much
more: because in the confused things, the genius wakes up with news inventions."
(in "Treaty on painting" of Leonardo da Vinci)
