Tian'anmen Gate was the principal entry to the Imperial Palace during the Ming and Qing dynasties. It is one of the finest monumental gates in the world, extraordinary for its imposing size.

Let’s take a look at what it takes to create some fun, out-of-the-ordinary gate implementations. As an example, let’s consider the AND gate (the others are OR, NOT, NAND, NOR, XOR and XNOR).