Imagine an August midday in California. The sun is at its highest and shadows are harsh. The worst possible conditions for photography.
After walking all morning, you just want a place to rest in the cool shade for a while, but the only option is some black metal furniture baking in the direct sun, on which you could probably barbecue a steak.
However, as you approach the chair and table, you notice that the curves and circles of shadow seem to dance and whirl – teasing the lines and squares of pavement as if it were simply too hot and tired to do more than grumble at the indignity.
In a few weeks these spirals and curves will move their equations and formulae back to the school classrooms. But for now, you realize, this is the geometry of Summer.