This is the good work of Molly, using sparklers. The first sparkler burned off after "BURNING", so she used another one for "MAN". We did only one take (we had only 2 sparklers!), and the result was close to perfect!
And yes, the fact that the full-moon makes the dot on the "i" is pure luck! :)
Exposure time: 59 sec.
Photo taken at the Burning Man 2009 festival (Black Rock Desert, Nevada).