>>>* do you need a building plan for the construction of a dog house?
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>>Even the screws have blueprints at the factory.
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>
>That's pretty sad when even a screw needs a diagram (clapping hand over mouth).

How many people does it take to screw in a light bulb? :)

Seriously there are screw machines that operate by a carved circle of metal (a cam) which drives the cutting surfaces of the machine. So even the cam is a sort of physical blueprint for the screw.

I keep saying software should borrow a lot more from other industries.