Corona
Solar eclipse on Aug 21, 2017. Different exposures show the extent of the solar corona (atmosphere.) The red bumps, called prominences, are eruptions from the surface of the sun.
Sun Spots around the Clock
Sun spots appear to rotate with the day's time.
Additive
Used only a red and a green laser, but where they intersect it is yellow. Hey, that color theory actually works!
Electronics
RESIST or DIode
March for Science, Washington DC, 2017
Starling on Barbed Wire