What you can do with mortar and pestle
There are people who collect mortars. There are huge specimens of granite, Japanese porcelain. I love olive wood mortars and pestles. In general, one can say that the bigger the pestle, the better everything can be ground.
That one takes the mortar for peppercorns and other spices, that's clear.
But have you ever crushed garlic with salt into a paste - or capers triturated into a smooth porridge - possibly with parsley and then added olive oil?
You can grate sesame seeds or add pumpkin seeds and pumpkin seed oil, yummy!
You can grind almonds to a very fine flour. Or chop hard cheese, along with some dry bread.
The advantage of the mixer is the fast cleaning and you can see exactly the degree of comminution.
And now a tip for the toilet:
Place a tiny brass mortar with coriander seeds and some cardamom in the room. If you want to refresh the air, once briefly mortared - better than sprayed!
