These T-shirts are used in the course Computer Science 541, Programming Languages I as I have taught it in Springs from 1990 to 1997, and starting in Fall semesters from 1997 on. Some of these were used in other courses.
The images of the T-Shirts (and sweatshirts and dress shirts) are arranged in some order corresponding to recent versions of the course. Clicking on one of the links will display a (fairly large) JPEG image of the front or back of the shirt.