Tennis great Roger Federer hangs from the ceiling in nothing but his underwear and a swim cap

Twenty-time grand slam winner Roger Federer is unfortunately not at Melbourne Park for the Australian Open after retiring in September last year - and vision of what he's been up to proves he couldn't be any further from the tennis bubble.

The 41-year-old has instead immersed himself in the art world, with asneak peek at a yet-to-be-released documentary showing him suspended from the ceiling wearing only his underpants and a black swimming cap.

But why, you ask?

For an upcoming art exhibition by renownedSwiss artist and sculptor Ugo Rondinone titled 'Cloud Six'.

Federer was put into a series of bizarre poses while hanging from the ceiling in a harness so his body could be captured as a 3D figure via a high-tech scanner.

At one point he spent hours inside a full-body mould, while he also had his entire face covered in silicone.

Most retired tennis legends would move on to the commentary circuit for the grand slams, or charge big bucks as a speaker, but Federer said he wanted to forgo those typical paths and challenge himself.