Homemade Leslie speaker
Ah, the sweet sounds of the doppler effect - The rotating Leslie speaker design has a unique way of giving sounds a sort of warm temporal quality. There are many electronic simulations attempted but designing and building actual mechanical effects is plain awesome.
From the pages of MAKE:

Spatial Education MAKE:05, p.24 Subscribers - read this article now in our digital edition
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Original post by Collin Cunningham