A Circle of My Mind

The circle in my mind is a large one that even I could fit in if I wanted to. But I can see it when I'm out of it too.

I can also see a hand drawing a circle, but I never see an oval shape.

It kind of represents a tire on a car, turning; or on any means of transportation.

Also, I can see circles passing me as though I'm flying by and through them.

It's really hard to imagine a circle and when I see a circle in my mind, it's not clear. The mind is a weird thing and it's hard to understand how it works!