The moon isn't made of cheese. It's made of lime. Corona and ad agency Cramer-Krasselt have put up a fun billboard in New York City which—on certain nights of the month, from a certain angle—makes the waxing crescent moon look like a slice of lime resting in a Corona bottle. The next public viewing of "Luna Corona," at 15th Street and 9th Avenue in Manhattan, will happen this Friday and Saturday nights, if you're interested. For the promo video below, the agency trots out scientific types, who explain in hushed tones how difficult it is to get the precision just right for this. I'm not an astronomer, but wouldn't it be easy to line up the moon and the bottle throughout the evening by walking around with your camera to a different spot on the street? The billboard is cool enough on its own without making it seem too much like a true celestial event.