Whether islands float or not depends on what definition you use of the word "float". It has many definitions.
If you define "float" as "stay on the surface, be buoyant, be buoyed up" (as opposed to sink), then islands float, don't they? After all, they don't sink, do they?
On the other hand, if you define "float" as "move or hover slowly and lightly in a liquid or the air; drift", then I agree. Islands generally don't drift away in the water.
As for man-made islands, the Aztecs famously built a huge island in the midst of Lake Texcoco, and on this island they built Tenochtitlan, their capital city. But they also built many floating gardens called
chinampas in the shallow lake beds of the Valley of Mexico, not just in Lake Texcoco but also in the nearby Lakes Chalco and Xochimilco. What would the Americas have looked like if - as nearly happened - Cortez was captured during
La Noche Triste, and the Spanish conquistadors faltered?
Some islands are countries and some countries are islands, but no man is an island, although you do have the Isle of Man but not Isle of Woman (though Lesbos is a strong candidate), but then
Isla Mujeres off the coast of Mexico also applies, as it translates as "the Isle of Women".
These are some thoughts that prevented me from pursuing my PhD.
