Essential to this whole mediated toynbee thing is a starting point – a machine-readable symbol that takes you to mtoynbee.com. In three sizes (for no good reason), I give you your mtoynbee.com QR Codes:
You can right-click on any of the images above and do a save image as, or you can click here for a zip file containing everything.
You can put the codes on stickers, have them tattooed anywhere on your body, etc. but in my mind the canonical use is to cut out linoleum tile matrices and embed them in road surfaces.