Poetry and progress find architectural expression in the four magical island pavilions that form the centrepiece of Switzerland's Expo.02
It's Expo time again. This year, it's the turn of Switzerland's Three Lakes region to erect a series of fantastical pavilions and hope enough visitors turn up to pay for them.

Expo.02, which opened last week and runs until 20 October, has 38 exhibitions and a programme of 1500 cultural events centred on four temporary expo-zones – or "arteplages" – on the shores of lakes Biel, Murten and Neuchâtel, near Bern.

The highlights of the expo are four expressive structures built on the water at the four locations, each representing one of the exhibition's abstract themes and linked to the waterfront expo-zones by footbridges and water-taxis.

The town of Bienne has a cluster of angular towers, signifying progress; Morat has a floating monolith, representing poetry and mystery; Neuchâtel has three pebble-shaped structures, symbolising the conflict between nature and artifice; and Yverdon-les-Bains has a cloud, exploring the human senses.