I think everybody has a dream of flying at least once in their life. For me, it's been over and over a recurring dream. It's mostly that. That desire to be as free as the birds, to be unhindered. I started off as - and am still - a free solo climber. So being in the air is a huge fear of mine. So there's a combination of going toward my fear as well as being fascinated with the air.
A horse loves freedom, and the weariest old work horse will roll on the ground or break into a lumbering gallop when he is turned loose into the open.