Congratulations to C Greyn of London W2, who managed to spot the four changes we made to the building above, Corb's Villa Savoye. For the chance of winning a bottle of champagne, readers are asked to spot the deliberate alterations we've made to Aldo Rossi's residential building in Berlin, top. Clue:
there are three changes. Post your answers, to arrive by first thing Monday morning, to AJ Ring the Changes, 151 Rosebery Avenue, London EC1R 4GB, or fax 020 7505 6701. The first correct entry pulled out of the hat wins the bubbly.