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City Hall is my favourite building. It's designed by Norman Foster but could equally well have been by Future Systems. I like it because I think it's the tip of a vast iceberg of what we'll see in the future – buildings that reflect natural shapes. Throughout history and up until now, buildings have been built with right angles and squares.

In fact, metaphorically speaking, you could say they've been dictated by the 8×4 piece of plywood. We live in square buildings, work in square buildings, everything's built according to a block. In nature, everything is rounded. What's happened now is that the technology has come to exist to be able to economically build buildings that reflect natural shapes and aren't square. It's fantastic that Foster has done it and I think it sets a tone for the future.

My least favourite is the Water Gardens on Edgware Road. I've always defined bad taste as something that's trying and pretending to be something it's not. Those flats pretend to be luxury flats, but when you go into them, they feel like glorified tower blocks. They have an atmosphere of temporary residences.