A diagram illustrating how the Apple logo owes it’s perfect proportions through use of the golden ratio.

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The iPhone DJ Mixer($120) features let you combine music music from two iPhone, iPods or mp3 players or one of each. It has a spin option; 2 effects programs with reverb, flange and filter and cross-fade slider and recording option, as well as a speaker system connection and microphone jack. And it can charge your iPhone, iPod while you mix.