Artist Vong Phaophanit's proposed contribution to Nicholas Grimshaw & Partners' Bath Spa project has now been revealed - an installation of water and steam in front of Thomas Baldwin's Cross Bath of c.1784, possibly extending up colonnaded Bath Street to the shops of Stall Street. For 10 minutes every hour, tiny concealed nozzles in the road will emit fine jets of warm water, rising to knee height. In the winter, with the jets kept lower, the installation will resemble 'a carpet of steam', while fibre optic lights will make it glow at night. The intention is to connect Grimshaw's new spa complex visually to the Roman baths, and reinforce the presence of the complex on the busy north-south axis of Stall Street. The scheme is on show at the Hotbath Gallery, City of Bath College, Hotbath Street, Bath until 21 June, where comments from the public are invited.