The Lunatric Prism is a wonder of the wizarding world. Cut from a great crystal said to have fallen from the dark side of the moon during an eclipse, this prism can show you any color you like as it splits white light into a full spectrum of colors! The wizard Floyd Wallbrique even tried to combine different elements of magic through it once to produce a pure, more brilliant magic. While the explosion did not result in brain damage, the property damage to the Academy of Magic was so great that he is still on the run.
There are several references to the band Pink Floyd, and its album "The Dark Side of the Moon in the description of the Lunatric Prism, which features a triangular prism separating white light into a rainbow on its cover.
The crystal falling from the dark side of the moon is likely a reference to the name of the album.
The name "Floyd Wallbrique" is likely a reference to the name of the band, and one of their songs "Another Brick in the Wall".
"Eclipse", "Any Colour You Like", "Brain Damage", and "On the Run" are all songs on the aforementioned album.