The xkcd store

Self Reference

The Self-Reference Shirt, loosely based on Comic #688 , has on it a set of charts and graphs precisely describing itself. On the front is a white pie chart showing what fraction of the shirt's area is white, and on the back are a series of black and white charts and figures describing in more detail the size and location of black and white areas of the shirt.

Since the graphs are describing their own content, it had to be designed to avoid any contradictions, and since a change to any one graph alters all the others, it took a lot of careful measurement and fine-tuning to precisely calibrate the size of each chart element, and the design was adjusted for each size of shirt to ensure accuracy.

In case anyone was wondering, Douglas Hofstadter's birthday is February 15th.

new things