Disappearing Descartes Heat-sensitive Mug

When a hot drink is poured into this mug, the caption changes from "I think therefore I am" to "I think not", and the image of Rene Descartes disappears - mostly.  This is the last remnant of some slightly faulty mugs; the images don't disappear fully (see pictures) but the joke still works!  Sold at a reduced price.

Porcelain Mug.
Measures 9cm high.

Collections: Mugs

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