From The Craftsman by Richard Sennett:
Pope Sixtus V remade the Piazza del Popolo in Rome at the end of the sixteenth century by describing in conversation the buildings and public space he envisioned, a verbal instruction that left much room for the mason, glazier, and engineer to work freely and adaptively on the ground.
Blueprints – inked designs in which erasure is possible but messy – acquired legal force by the late nineteenth century, making these images on paper equivalent to a lawyer’s contract.
The blueprint signaled, moreover, one decisive disconnection between head and hand in design: the idea of a thing made complete in conception before it is constructed.
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