And what if our knees bent the other way round?
What would chairs look like?

I suppose a skin filmed with phosphors and sensors would give a reasonable apprehension of our local space by sensing the background radiation of just about every thing.
Considering the wavelength of say, gamma rays, the resolution would be many orders of magnitude finer than we can obtain with visible light.
Hmm, thanks for getting me started, 'bout to partake of some very Sativa Sativa, and fancy unto fancy link.

If you no hear from me in a week or so, send Indica.

Aloha, Y'all,
Have a good holiday.
Weeze