A hot air balloon was inflated to fill every available inch of the gallery, i.e. once inside we saw only balloon silk lining the floors, walls and ceiling of the Marc Foxx space. The skin of the balloon was continuously plumped up with regular temperature air via two standard fans just visible there at the edges of the entrance. Wire straps fixed the balloon to the wicker basket, forcing the entering or departing visitor to dip down, as if passing under a country fence. I did wish there was fire involved.

All three images by the matchless Sergei Prokudin-Gorskii, roughly 1911, from the Library of Congress Archives.