I never heard about 'the wheel experience' in reference to salvia, but my last experience 8 years ago smoking some potent stuff from a bong left an impression (and a physical scar!) My vision was of a cluster of Mayan deities rolling across the landscape. The spirits were linked like circus acrobats holding hands to feet and attracting etheric bits of impure matter from souls.

I saw a doorway and felt the timing was critical in stepping thru...wait...wait....now! Next thing I knew, I woke up in a field near my house and was bleeding from my eyelid. I guess I hit my face on the doorframe at some point in my trip. But when I was coming to my senses, I had an intuition that something 'unholy' had come out of me at my eyelid. Needless to say, the experience scared me so badly that I never smoked it again.

On a side note, when I got married years later, my wife bought a game for the Nintendo Gamecube called "Katamari Damashii" that involves rolling a big ball of stuff over the landscape and being able to pick up bigger and bigger stuff as your ball grows (i.e. cars, animals, people). She translated the word as "sticky ball of stuff" but a cursory web search yields the more interesting (and accurate from my salvia vision) definition: "clump spirit."