The 2005 Serpentine Pavilion  was a collaboration with Alvaro Siza and Eduardo Souto de Moura. Conceived as a ‘crouching animal’, it features a curving roof shape that turns at the eaves to splay outwards and downwards to the ground. Balmond shuffled the grid of the structure so that a cascade effect developed. This displacement sent a vibration shiver right through the form. The mortice and tenon joint adopted for the timber produced a vernacular feel to the structure and made it almost medieval. The gridded animal then came to life. And its skin, made out of polycarbonate, was studded with solar lights that came on at dusk.