A stamp that read:

The Bureau wishes to advise that silence can be saved and turned into substance by following these simple directions. Enter a room in which there is a telephone, wait for it to ring, answer it and note the date and time of the conversation: _______ at _____ am/pm. Now wait again for a second conversation: _______  at  _____ am/pm. Calculate the length (substance) of time (silence) that passed between these two conversations by making every 60 minutes equal 3 centimetres: _______min. = _______cm. Results are to be recorded in the ‘Encyclopaedia of Silent Art’ at the room for two corners and a cube. Thank you.

Stamped by the Bureau of calculating silence © 1965