A venn diagram is a diagram that shows all possible logical relations between a finite collection of different sets. It's also the perfect way to show somebody you care about them, or at least to reduce them to a set of quantifiable traits("you"/pale blue circle), to be listed along with a set of your own traits("me"/yellow circle). Where these sets overlap, the green, represents the nature of true love. For example, I might put "synthesizers" in the yellow circle, while my wife might put "short fiction" in the blue circle. In the green circle would be "things Nick says on New Girl". 

Note: this doesn't have to be a valentine's day card, it can be used for any purpose. It is purposefully left blank.  

This A6 (6.25" x 4.5") card is printed letterpress from two polymer plates (the circle did double-duty) on Crane's Lettra 110# Pearl White cotton paper on a Heidelberg Windmill 10x15 in Brooklyn, New York.