According to Platos idea of the universe, that is based on mathematic relations, the beauty of geometrical forms is fundamental (Timaios).
Two of the most beautiful forms, pointed out by Plato, are those rectangular triangles with corners of 90°, 45°, 45° and 90°, 60°, 30° degrees - they are fundamental for his cosmology. The most headlands, as seen on numerous beaches in Greece, end in on of the above two forms, creating a severe and common but nevertheless beautiful and harmonious landscape.