The size of the circles made by gas varies according to the hand
gesture. Rapid movements make larger loops. The color alternates
between black and white.
strokes
valid strokes values are whole numbers from 1 to 20.
EXAMPLE
gas 10
Ten strokes of gas, or ten clicks.
ORIGIN
Gas was written for Lexicon in 2002. It is based on code written
in 1997 for the Blackboard
(1998).