The Forestry Department runs a coral reef restoration project across the length of the coastline, huge balls of concrete punctuated with openings - fish holes - that encourage new coral ecosystems to take root, which in turn absorb calcium and carbon dioxide from the acidifying water. The reef balls are lifted by crane from government barges, and gently settled on the sea bed. I watch the livestream on youtube, captivated by its methodical slowness and enthusiasm.

Pak Uning explains that when he dives to check the health of coral reefs and the reef balls, one of the small jobs he does for the Forestry Department, he never fishes under water, for example by spearfishing - not his alam.

He got the idea for rumah ikan while he was on one of these dives, making worlds for marine ecologies.