Ever heard of a Gobo? Strobist photographers have been using them for years and years–essentially a GoBo is a go-between that modifies the light output to shape it and define it in a certain way. An umbrella and a softbox are gobos: but so could a piece of plastic or a strange glass. In fact, the utterly bored yet imaginative folks over at Pop Photo tried to do just that. But in a new series that they’re starting called “Random object lighting modifier challenge” they decided to slap a glass candle holder on the business end of a flash.