What wood knots look like inside a tree trunk - photo

[Jon]

What wood knots look like inside a tree trunk.

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[jdurand]

So if you cut a tree just above and just below a bevy of branches then knock out the inner bits you have a spoked wheel.

[Frank S]

So if you cut a tree just above and just below a bevy of branches then knock out the inner bits you have a spoked wheel.

Sure looks like it even have the hub as well.

[FEM2008]

I won't be surprised that is how the first spoked wooden wheels came about.

[Toolmaker51]

What wood knots look like inside a tree trunk.

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Mr. Flintstone's car ran on stone rollers....his motorcycle certainly had these, but he still had to pedal, just like the car.

[NortonDommi]

A fine example of early civilisation advanced bio-engineering.