Illogical Concepts of Pestle and Mortar

Task given are to create 3 conceptual designs based on the words we choose that can be associated with the pestle and mortar, and it does not have to be illogical. 
my first out come is the scientist take it as a musical instrument cause the pestle and mortar when hit together will produce sound
my second though are a protective stuff to avoid being hurt by stranger where people always bring it along with them
Third are they used in games where mortar to scoop and pestle to pass around.