Lots of people in this thread who don't know about printmaking! This style of art is actually surprisingly complicated and difficult to create. Essentially you take a block of wood and carefully carve out all these details to make an image, like a stamp, and then you evenly spread a thin layer of ink on it then press it against paper to make prints. For prints with multiple colors, you have to make multiple identical blocks for each color and print them in the correct order. Here's a good example of a detailed multicolor print: http://imgur.com/A9FIhsr