Backyard Stonehenge

If you have a few minutes, this is a great video you can actually watch at work.
It's about some guy who has figured out simple ways of moving and lifting multi-ton pieces of stone so he can build a mini-Stonehenge in his backyard. I can't fathom how "Wally's" mind works. I mean, how long does it take him to figure out these contraptions? I hope he's an engineer or something...