Solar Pillar


Here is a lovely solar pillar. A solar pillar is an atmospheric optical phenomenon in the form of a vertical band of light. The effect is created by the reflection of light from tiny ice crystals suspended in the atmosphere or clouds.

Equinox Sunset


This is sighting down Cabrillo Street in San Francisco. The street runs east-west. That’s the Pacific Ocean about a kilometer down the hill. I took this photograph on the equinox. Given that on the equinox the sun rises due east, and sets due west, the sun should set — for one day only — in the dead center of the street. Here’s the proof!

That’s me above the clouds.

Nature’s Computer is Analog

Nature's analog computer

Nature’s computer is analog. Here we see the nearly instantaneous soapy solution to a second-order partial differential equation in the form of a minimal surface bounded by one of the five Platonic shapes, a tetrahedron. Try that with your digital computer!