The shape of things to come

Visiting the International Fair of Dakar is like taking a stroll through the ruins of some ancient Toblerone-worshipping civilisation. A cluster of triangular pavilions rises from a podium, each clad in a rich pattern of seashells and pebbles. These are reached by triangular steps that lead past triangular plant pots to momentous triangular entrance ways. All around, great hangar-like sheds extend into the distance, ventilated by triangular windows and topped with serrated triangular roofs. All that’s missing is triangular honey from triangular bees.

Built on the outskirts of the Senegalese capital as a showcase for global trade in 1974, this astonishing city-sized hymn to the three-sided shape was designed by young French architects Jean Francois Lamoureux, Jean-Louis Marin and Fernand Bonamy. Their obsessive geometrical