For an object under the eye will appear very different from the same object placed above it; in an inclosed space, very different from the same in an open space.
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About Vitruvius
Vitruvius was Roman 1st-century bc roman architect and engineer. Vitruvius was a Roman architect and engineer during the 1st century BC, known for his multi-volume work titled De architectura. As the only treatise on architecture to survive from antiquity, it has been regarded since the Renaissance as the first book on architectural theory, as well as a major source on the canon of classical architecture. Read more on Wikipedia →