Memento Mori is Latin meaning: Remember You Will Die. life is short Better use your time. This is because in the past, especially in the 14th century, the world was faced with a plague that killed many people. Including the cause of the war scramble for territory and resources. In the 16th century, clocks were invented to tell the time in everyday life. but at the same time raise awareness of the short life at the same time with the passing of time and never stopping to wait for anyone leading to the creation of a skull-shaped clock later to remind us how close death is to us It was very popular amongst the aristocracy, such as the silver skull clock engraved with the Bible. by watchmaker J. Moysan of Blois