New t-shirt design

I'm teaching a screen-printing course at the moment, and took the opportunity to go in to the studio in the weekend to (a) cater to the increasingly panicky requests for aid from students rapidly approaching deadline, and (b) to print a couple of t-shirts.

The image is one that I was using as a demo for the students, and I thought I might as well get some use from it before the screen is water-blasted for re-use.