this is more art than innovation, more concepts than creation. but anyway, it's time to get stuck into this great big, noisy, colourful event, one in which water cascades down into the desert and then at night, with a trick of the light, it cascades back up again. but bringing water into the desert is a bit of a metaphor for the times we live in. sustainability is a big theme at the expo, but will societies, whose wealth and comfort have been built using fossil fuels, really push hard to go green? amongst all of the distinctive designs, one building does stand out as an oasis of green. this is the singapore pavilion, giving us a glimpse of how a city and nature can co—exist. now, singapore is actually a pretty green place already. a lot of its buildings and bridges have an almost post—apocalyptic amount of greenery growing up them.