I have to do excursion tours in our labs for school students. So I made an educational T-shirt and pupils can learn by watching me (because my talk is so boring they are definitely not listening to me). On the back side (back as history) is shown a current SI system. On the front is pictured a (probable) new (future) SI system.
Front and back pictures:
Licence: Free culture license, but please give me a credit, and send
me a photo of you in your new t-shirt if you like.
SI T-shirt by Martin Šíra is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.