A beautiful design inspired by history! In the early 16th century, Leonardo Da Vinci illustrated "La Divina proportione" (literally: "The Divine Proportion") - a book written by the mathematician Luca Pacioli that described a mathematical theory used in paintings and sculptures of the Renaissance to achieve balance and beauty. Da Vinci later referred to this as aurea or the "Golden Ratio." The front of the cards, as well as the individual back of the Bicycle® "Aureo," feature unique designs inspired by Renaissance art and the Golden Ratio. The gold foil and the exclusive attractive swirl designs on the packaging bring the Golden Ratio to life in this unique deck of cards. Target audience: design enthusiasts. Also ideal as a gift.