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Many related works can be found at:

http://orangenarwhals.com/hexblog/2019/09/30/HCI-PL-Class-Work/

Our repository can be found at:

https://github.com/L-Zharmukhametova/papersignal

With deploy at:

http://custompapersignals.herokuapp.com/

How to replace with cheaper electronics? Non-trivial

Difficult to undo glue…

Future work: Takeout box inspired, diecuts