Proof of Concept
We purchased an inexpensive laser engraver 
, engraved the design on a thin piece of balsa wood, and then pressed it into the clay. The result was acceptable, but not as high quality as we would have liked.
The Real Thing
Amir sent the design to a student who had access to a high-quality braille printer. The resulting mold, which was made with LED UV cured embossing on acrylic, has much better detail. It is also much sturdier than balsa wood.
The next step was to use a printing press to “roll” the clay slab.
Amir used paper bags to protect the clay from getting on the press mechanism.
And here’s the flattened clay, ready to be impressed with the mold.
The next step was to oil the TFT push mold (Amir used castor oil).
Then, Amir pushed the mold for the first side…
…and trimmed the edge to pull out the first side.
Then, Amir applied the other side of the mold.
He carefully removed the first side, and was even more careful for the second side.
And, voilà—a token, ready to be fired in the kiln!
Here is a test run of tokens in the kiln after being fired.
The finished tokens, front...
...and back.
Most of the tokens in this test run are thin...
...but Amir made a few thick ones, which look fairly impressive.
Totally Fungible Tokens by Amir Esfahani and J. D. Eisenberg is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.