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I see a book in the making called, "Electrical Engineering for Dummies". BTW, that sounds redundent.

I worked a concert where the sound guy insisted on bringing in his own lighting rig... Had a wooden box built in similar fashion, with metal switches. Used the damn thing for "effects" during a concert; great effect, hearing "click click" in sync with the lights changing.

That's why we generally keep the sqweeks (sound guys) from doing anything other than play with their mics.

As a sound guy you'd think he should know about interference...

I once had a somewhat sub-standard light controler too, but that one had a properly attached cord with plug and strain relief, and it was only used far away from sound equipment (the sound equipment was plugged in on the ground floor of the school and I was sitting up on the 3rd floor with my box controling an 18W fluorescent bulb (in a rice paper ballon suspended above the yard to imitate the moon) and a string of Christmas lights.

The contraption was only used for one rehearsal since the performance didn't happen anyway due to bad weather... you neither want your audience to be rained on nor the performers be fried on a metal balcony together with indoor cords and equipment...

is that some electrical tape holding up the first outlet on the left?

no that's just the fancy design of these outlets - the covers come with exchangeable colored stripes on either side. In htis case they used the black ones. The box was actually built with great care, but feeding it using a cord with two male cord caps is just plain lethal.