Sitting on the mortar bowl is similar to sitting on the toilet bowl with your bum reaching the water down below. Ewww! Haha. That means your bum is fitted in the mortar bowl so perfectly it makes a farting sound when you get up from sitting on it. That's why I love sitting on it. LOL :D
For my baby girl to sit on the mortar without sinking deeply into a V shaped babe, my mom placed a basketball ball at the bottom of the mortar so she is technically sitting on the ball on the image you see above.
This mortar has been with our family even during the Japanese occupation in the 1940's. It was one of the oldest properties of our father from his father before him that was hand carved from an old hard tree's base trunk. Imagine the roots being manually hacked and chopped off with an axe and machete just to take this base trunk out. Then it was manually carved into the mortar it is now.
For almost a century, our family has been using this to grind our coffee, grains, and foods manually. No one ever knew of blenders and food processors until the late 90's when electricity reached the mountains.
As per Wikipedia's definition: The mortar (/ˈmɔrtər/) is a bowl, typically made of hard wood, ceramic or stone. The pestle (/ˈpɛsəl/) is a heavy club-shaped object, the end of which is used for crushing and grinding.
A very tiny version of it is usually found among kitchenware which is used to grind or press garlic, pepper corns, and ginger.