Since I work a lot on print projects and I really love the offset lithography as printing process, I designed my new business card in a small format and four different colors: Cyan, Magenta, Yellow and Black. These are the four inks used in color printing, contraction CMYK, where the letter K stands for Black for some tricky reasons – if you want you can go deep to the heart of the subject on the Wikipedia page dedicated to it.
Actually one of the most delicate phases in the offset process is the alignment of the four colors during the various passages of the paper into the printing press.
For the same reason I put some little translucent geometric shapes in the corners. So that approaching four minicards the magic happens: some perfect slanting squares at the intersection points appear, as you can see in the image below.