How does one use this square water dropper and what do you use it for?
If you look closely, there is a small hole in the porcelain, that would allow the scholar to drip a single drop of water onto an ink stone. Ink was sold in solid blocks that needed to be moistened in 19th century Korea. It was filled by submerging it in a pot of water.
This was used by a member of the elite literati class, who dedicated themselves to the pursuit of knowledge.
What is a water dropper?
A water dropper was used to wet ink stones or blocks that needed to be moistened so that scholars could pick up the pigment with a brush to write. If you look closely, each one has a small hole at the top that would drip the water out when inverted.