A bubble window is a round sphere that protrudes from a wall. Among all the geometries of windows, it is one of the rarest types to find, since most constructions use flat glass, but definitely one of the most playful to see.

Fun Fact: helicopters often have bubble windows, because these allow a greater view span above and below. This way, missions can be executed with minimal impact thanks to this phenomenal weird little window. This below isn’t exactly a bubble, but gives a good sense of the expanded view that is given from protruding windows.

Read more: https://www.heliflieger.com/en/bubble-windows-or-the-house-with-the-red-roof/