As a scholar I am interested in the philosophy of language, semiotics, call it what you want, and one of the main features of the human language is the possibility of lying.
I think you have to control the materials to an extent, but it's important to let the materials have a kind of power for themselves; like the natural power of gravity, if you are painting on a wall, it makes the paint trickle and it drips; there is no reason to fight that.

