A basin used to store and review memories, used by Albus Dumbledore and Severus Snape
A shallow basin lay there, with odd carvings around the edge; runes and symbols that Harry did not recognise.
Harry Potter and The Goblet of Fire
by J.K. Rowling
One simply siphons the excess thoughts from one's mind, pours them into the basin, and examines them at one's leisure.