I presented the Galathite (milk stone) already, now i found something similar: cheese buttons.
This way you can skip the preparation of the milk.
In the instruction they compare several sorts of cheeses and try whether the buttons can really be used.
Perhaps I will buy some extra-Edam next time in the supermarket ;-)
Links:
Cheese Buttons (Buttons: an experiment with cheese)
Here at unikatissima: Galathite (milk stone)