“The line has in itself neither matter nor substance and may rather be called an imaginary idea than a real object; and this being its nature it occupies no space. Therefore an infinite number of lines may be conceived of as intersecting each other at a point, which has no dimensions and is only of the thickness (if thickness it may be called) of one single line.”

—  Leonardo Da Vinci

The Notebooks of Leonardo da Vinci (1883), II Linear Perspective

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Leonardo Da Vinci363
Italian Renaissance polymath 1452–1519

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