His explanation at the end said 30% of viewers got the concentric rings visual right cos he recorded it three weeks before and had time to place subliminals in lots of papers.

He asked the woman what she was thinking of when she drew it, in the live explanation, though. She said stonehenge, which 10% of viewers had gotten as a visual, and he had guessed too, as she stepped out of a box to find he'd left her at stonehenge, but he could have subliminally suggested this to her as she was drawing too, I guess.

Doing some rock carvings yourself is an even better way to get lost in the design. I carve rocks with newgrange type spirals on them and find myself kind of zoned out by them by the end.