I took Danger to Burning Man in 2007.
A yellow triangular pyramid topped with a flashing red strobe stood alone in the deep playa. The sides of the pyramid were marked with hazard signs: radiation, biohazard, and toxic. When approached, the pyramid emitted a verbal warning “Danger – Stand Back” and then (at closer range) a klaxon sounded.
Danger was placed at 12:00 and 4900 ft from the Man. As you can see, I went all-in on the safety yellow.
A base holding the electronics was staked with rebar into the playa and the pyramid was screwed on to that. It ran all week on a 100Ah deep cycle battery.
Here’s the design sketch that I included in my submission to The Artery.
Danger was powered by a talking car alarm with an ultrasonic range sensor.
The pyramid was constructed from plywood and angle iron.
It was painted safety yellow and stenciled with the hazard symbols.
Since I had the stencils, I made some shirts to give away!