Inspired by deep-water soloing in Mallorca or just an entrepreneurial brainstorm? Either way, it's a brilliant idea. Aquaclimb has teamed with wall builder Pyramide USA since about 2005 to install these modular poolside climbing walls. The fiberglass panels and plastic holds extend up to about 10 feet above the water surface, and the panels can be rotated and holds moved to change the pattern. I'm not big on hanging out at swimming pools, but this would make the cruise-ship or hotel-lounging experience a bit more interesting. Although the basic routes don't look challenging to a "real" climber, the beauty of bouldering is that problems are limited only by the imagination.