The photo shows the setting sun, severely flattened by stratified layers of air at different densities caused by the uneven mixing of a new cold front with a much warmer lingering mass. As the Sun descended, it was more and more distorted by differential refraction and acquired many different shapes, including: mushroom, pancake, disk and finally a very thin rectangle. It was indeed a delightful treat to end the day.

Handheld Nikon CoolPix P900 camera at manual mode

Photoscape was used to improve contrast with reduced noise.