I saw on the book " Encyclopedia of Card Magic" on the "one way deck" section that the standard bicycle playing cards are a one way design but anyone know where is the "mark"? Also if you didn't knew most of the bicycle decks are a one way deck: Guardians (The backgroud), Skull (there is a white line on one of the skulls), Dragon Back (the head of one dragon is more thick and the eye is more closed that the others & the aristocrats (that i will not tell you where is the mark )