Time for yet another Mathmos lamp! Continuing their candlelight theme, Float, instructs you to fill its glass with water, insert a candle into the glass, and then light it. Instead of the candle burning down the way, the light remains where it is, and the body of the candle moves upward due to its desire to float on the surface of the water. I'm a huge Mathmos fan, but Float just seems to want to be clever rather than fit in with its good-looking siblings. Why can't you do both, Float? Although, I know that at some point soon my universal love of Mathmos will kick in, and I'll have to buy one. Hmm, that frosted glass one looks really good.

£35/$67 from Mathmos direct.