Flash versus Ambient light

Vicco Gallo has added a photo to the pool:

Trick question: which one is shot with flash, which one with the ambient light in my room??

STROBIST: You guessed it, the left one is shot with flash, and here comes how: I put a little snoot (a reeeaaaally little one, diameter 1 centimeter, made from a slaughtered ballpen) to my flash and sealed that with gaffer tape.

Then I changed the pilot / test flash from my 430 EX II from one-shot to modelling flash (so from now on it shoots approx one second of short flash pulses when I hit the pilot button). Then I set my cam on a tripod and on 30 sec and did some light painting with that flash :-)))

Yes, a torchlight would have been much easier for that lightpainting job, but the spectrum of the flash is much better for food than these LED or tungsten lights.