Rishi Sowa has built himself a floating island using plastic bottles, netting and plywood, with mangrove helping to hold it all together. Find out more at spiralislanders.com.
This interests me because I’ve recently gone back to Heavensent, the propellerpunk tale I wrote a few years ago, with a view to revising and expanding it. Early in the tale some of the characters are trapped on a floating island which has evolved in a section of a vast ocean where the eddies of the current have trapped lots of flotsam. The idea was that algae had trapped seeds which had sent out roots, further binding things together, until a floating landmass had been formed. As the tale is set at a time of lower technological advancement than today it wouldn’t be too much of a stretch to imagine some of the starting material being wood and other biodegradable materials. This shall feed back into the Heavensent rewrite.