Mysterious Optical Phenomena (that are so tasty!)

My research into diffraction and holography has thrown me into a vortex of new ideas that are eating my brain. I will list them here along with my favorite line from their corresponding wikipedia articles.

Parhelic Circles "Even fractions of parhelic circles are less common than sun dogs"

Anthelion "How anthelions are formed is disputed."

Solar Glories "Glories are not conclusively understood."