'Spot the Building' asks you to identify a well-known and recently completed building. To make it just a little more difficult we have had fun playing with the image. If you can decipher it, post your entry to arrive by first thing on Monday morning to The Architects' Journal, 151 Rosebery Avenue, London EC1R 4GB, or fax 020 7505 6701. The first correct entry pulled out of the hat wins a bottle of champagne. The building featured in the last competition (AJ 17.2.05) was the Black House in Cambridgeshire by Mole Architects. Cassius Taylor-Smith of Wordsearch, London EC1, was the winner.