I know I'm wasting my time checking out the "outdoor furniture" section, but a girl can dream, right? I mean, how fabulous is this Atollo series by Modo Luce?
The illuminated Italian furniture is oh-so-chic. The technical aspects as far as its engineering is not explained, but I'm sure your bum will be nice and toasty after a delightful sit-down. I don't think these are available in the US, but you can certainly expect to pay a pretty penny.