Humans have always created their own designs, and in the dark times before the rise of computers, engineers used technical drawing to describe three-dimensional objects.

You’ve probably done some basic technical drawing yourself at one time or another. Maybe you made a sketch for a coffee table you were building, or you drew a simple floor plan of your bathroom to show a contractor where you wanted that new whirlpool tub.

In both these cases, the idea is the same: to illustrate something physical as clearly as possible. It’d be inconvenient to come home to find that your contractor had blocked the bathroom door with your ...

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