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To build a tower of cards, start by taking 2 cards from a deck of cards. Place them about two inches apart from each other, then lean them together in an upside down "V", called an "apex". Construct another apex next to the first apex, with about 1/2 inch (1 1/4 cm) between them. Take a card and place it horizontally on top of the two apexes. To begin constructing the second story of your tower, build another apex on top of the horizontal card. For a larger tower of cards, put more apexes in the base layer. Connect each pair of apexes with horizontal cards. Next, place an apex on top of each horizontal card. Your tower is finished when there is only room for one last apex at the very top.