WHY THIS MORTAR AND PESTLE DIFFERENT?!

Do you know what is mortar?  How about a pestle?

if you don't know what they are just look at this picture:

when peoples know what is mortar and pestle they must be know what it is used to be (to smash something and make it smooth, usually they use it for cooking ingredients)

but you know, maybe in the past or in the future this mortar and pestle can be something else maybe like this..

Microphone and Speaker in the future maybe,

Or maybe they use it for hair curler in the past??

how about use it as a weapon? like BOMB!!