This is a single playing card that has been cut and folded to create what seems to be an 'impossible object'. Clearly the name Cardhenge derives from the prehistoric monument Stonehenge.
It has been made from a larger than normal playing card (178 x 117mm) although the designer has told us that while it would be possible to create the same effect with a normal size playing card, it would take much longer, as it would be even more fiddly.
Is the whole card still present? No, there is a circular piece that has been removed.
Each Cardhenge will be a different card value.