Forcing yourself to use restricted means is the sort of restraint that liberates invention. It obliges you to make a kind of progress that you can't even imagine in advance.
Pablo PicassoHave you noticed that bones are always modeled and not carved, that you always have the impression they come from a mold, that they were first modeled in clay? Any bone you look at, you always find fingerprints on it.
Pablo Picasso