I believe that these were made by German magician Peter Kersten in limited quantities many years ago.
The magician introduces 6 cubes that are decorated with card fragments. He seemingly arranges them at random and then covers them with a silk. Two cards are then selected and placed face down on the table without anybody looking at them. A spectator then turns the first card and uncovers the stack, the stack has arranged itself to represent the selected card perfectly. The stack is then covered again and the the magicians seems to be doing some mixing of the cubes without looking. Then the stack is revealed and is completely random. In now way it represents a playing card but yet when the second card is turned over, it matches perfectly. This looks hilarious.
This item is preowned and works perfectly. It is in good used condition with some minor blemishes.
You receive the original German instructions with a very brief English write-up. Cards are Bridge size. Supplied in a nice wooden “trunk”