that is an unbelievable Rube Goldberg machine, and I am willing to put money that it is all real. As was said before, the tires likely are top weighted, and when the bottom one is bumped the weight carries it up hill. Most likely it hits the next tire with the weight at about 1/2 to 3/4. this is why it continues to roll uphill. There are likely angled brackets that the tire can roll uphill over, but can't roll back down (like a fixed toll-booth spike strip type thing).
Excellent find.
