It is those who concentrates on but one thing at a time who advance in this world. The great man or woman is the one who never steps outside his or her specialty or foolishly dissipates his or her individuality.

The approach of death certainly concentrates the mind.

Certain kinds of speed flow intensity density of attacks density of interaction... Music that concentrates on those qualities is I think easier achieved by free improvisation between people sharing a common attitude a common language.

I've also long since realized that the way to really engage children is to give out prizes it's amazing how it concentrates their minds.