Opera Square, Cairo, probably in the 1930's, The opera building is on the left. It was destroyed by a fire in 1971. On the right was the Intercontinental hotel. This square was one of Cairo's central squares.
The Golden Ratio: a designer's guide. The Golden Ratio is a beautifully simple piece of mathematical theory that can help make your designs feel well proportioned and pleasing on the eye. We explain how to use it.