Associated mind map

On the stone age, people make umbrella using mortal and pestle.

The above picture is a man holding pestal as weapon and mortal as shield, although the shield is a bit small but it work just fine in the ancient time.

This is a game using mortal and pestle, it is easy just throw the pestle into the mortal then you win the game.

From this picture we can see that we can use mortal and pestle to create sunglasses.

We can use mortal and pestle to create headphone, the mortal will put on your ears and inside the pestle will contain the wires