The circle symbolizes the source of consciousness which creates this reality.
Circles have used in rituals and ceremonies, since the beginning of time. Not sure the intent but they have gone out of their way to create these and not sure what they have to do with bees.

Is this a gussied up backyard trampoline? If so, I've got some work to do out back...

totally does look like a huge trampoline

i thought trampoline too, which would be so awesome!

It looks like a backyard hot tub. A Woody Allen's "Sleeper"-era backyard hot tub.