I like when beer gets so clear in the secondary you can see a laser bounce inside the fermenter, all the way to the other side and back. Take a close look.
Can anyone guess by the shape what is obscuring the full view of the path of the laser?
The picture is of a glass fermenter at night. At the bottom of the picture is one of those infrared thermometers with a laser pointer tilted sideways. The laser beam is going through the vessel and coming back like a mirror image. The bright red dor at the top (the monster's eye) is where the laser beam is bouncing off the other side of the fermenter and coming back. Thought it was a cool view!