In Pictures: Apple's 15 boldest computer designs, ...
Macintosh Quadra 700, 900 (1991)
With the Macintosh Quadra tower, Apple looked to change its image somewhat from a Volkswagen Beetle to an American muscle car. No frills, just power. Quadra computers rivaled the most powerful PCs. The story goes that Apple hired Lexicon Branding to come up with the name. Quadra is a take on technical terms such as quadrant and quadriceps. There's no question Apple was flexing its muscles.
In Pictures: Apple's 15 boldest computer designs, 1976 - 2012