India, Jan. 30 -- It looks like a small spiral land formation rising out of the lawns of Delhi's Sunder Nursery.

The Aranyani Pavilion is made primarily from upcycled Lantana camara stems (notorious for invading and choking native landscapes), turning ecological debris into an architectural statement.

A biodegradable bamboo skeleton holds it up. It is crowned by a living canopy of jasmine, neem and tulsi plants.

At its heart, a nine-tonne rock that was dredged up as waste during a mining operation in Rajasthan sits in a still, shallow pool, the water reflecting the sky above.

The spiral walls that lead visitors inward form a rib-like cage that seems to breathe in the damp air.

The Aranyani Pavilion is the centrepiece of a 10-day even...