Instructables.com:

Here’s what to do:
1) Get a whole bunch of similar-sized innertubes from your local friendly bike store.
2) Cut them at the valve and cut the valve stem off.
3) Weave them in your favorite chair caning pattern, stretching them tight.
4) When you get to the end of an innertube, tie another one to it with a square knot. Arrange for all the knots to be on the underside of the chair.
5) Sit and enjoy the extreme comfort.
6) Stand and be acclaimed by throngs for your fine chair. Can you say “wabi-sabi”?

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