It is claimed all rainbows are circular, but we can only see half a rainbow from the ground. You can view circular rainbows from high altitudes, most commonly, in a plane as shown in the photo on the right taken by Anna Kim in Hana, Maui, Hawaii, US.
The Safe Space Alliance logo incorporates a circular rainbow. The rainbow acts as a barrier to violence, bullying, and hate speech towards LGBTQI+ communities, creating a safe space in the middle.
The circular rainbow represents: