Horizontal rainbow tetris

This was the direct outcome of the multicolored table after erasing weekends (they're are, after all, perfectly determined) and coloring the months with a rainbow scheme taken directly from Luis Pabon's fantastic calendar proposal. It looked remarkably like tetris, and that resemblance made me realize just how awkward the calendar looked horizontal--all the more awkward considering it made numbers run vertically when everyone expects them to run horizontally.

Verticalizing the design led me to my next version.