Why are the shafts different lengths?
The lengths of the shafts are inversely proportional to the lengths of the days during the course of the year. So the tallest shaft is the longest, since the winter solstice is the shortest day. Conceptually, this is because you would need to collect more sun on a short day to get the same energy. Visually, the forms reflect the sine wave that describes the lengths of the days – a shape we found to be quite beautiful.
