So, in avoiding other obligations, I decided to find more subtle ways to post a barcode.  The newly-ubiquitous QR codes are hard to miss, being all blocky and checkerboard-like, but traditional bar codes are easier to disguise.  I’ve got a fistful of ideas for how to do this, but here are the first three. After this, I am thinking of a ray gun blast, integrating it into a wood grain pattern, water from a shower head, and an urban skyline.

You can click on any of the above to get a larger image and which can be scanned with any barcode scanner app.