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Another classic arch is the recto. Its characteristic is that its height (above the springing points) is equal to its width. This arch was more commonly seen in windows, particularly where narrow recto arches were used as tracery within an overall frame of quinto acuto.

see site for many more - 1895 - Cusack's freehand ornament. A text book with chapters on elements, principles, and methods of freehand drawing, for the general use of teachers and students .. by Armstrong, Charles

Паола Волкова лекция История искусства Греция 1

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Greek and Roman columns chalk and charcoal

Stonehenge Stonehenge builders had geometry skills to rival Pythagoras Stone Age Britons had a sophisticated knowledge of geometry to rival Pythagoras – 2,000 years before the Greek "father of numbers" was born, according to a new study of Stonehenge.

From, "A Handbook of Ornament". 1898 by Franz Sales Meyer.

Nine simple math tricks you’ll wish you had always known

#190 Vinyl – A new minimal geometric composition each day

#190 Vinyl – A new minimal geometric composition each day