The temperatures we experience locally and in short periods can fluctuate significantly due to predictable cyclical events (night and day, summer and winter) and hard - to - predict wind and precipitation patterns. (earthobservatory.nasa.gov)
Hepworth's Sea Form (Porthmeor) emerges from a similar focus on cyclical events. (tate.org.uk)
The problem was his research showed the decline in Maple Syrup production was not caused by Acid Rain, but two natural cyclical events. (drtimball.com)