Funky shapes in a wide variety of colours characterise stretch tents which use a special technical fabric that is stretchy but also provides structural stability.
The fabric is anchored at its corners and along its sides, and then poles of different lengths are pushed up to create the iconic shapes.
There are several manufacturers of these tents and not all use fabrics that are properly water resistant and flame resistant, so it is important to check that the tents you are getting won’t let the water in and won’t catch fire.