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.
A garden is to be a world unto itself, it had better make room for the darker shades of feeling as well as the sunny ones.
Anytime in radio that you can reach somebody on an emotional level, you're really connecting.