inkstone
硯 centers on the inkstone, a flat stone used to grind and hold ink for calligraphy. The meaning is specific to this tool, with no broader abstract extensions.
硯 combines 石 (stone) and 見 (see), reflecting an inkstone as a stone object used in the visible practice of grinding ink.
The left side 石 is a stone, and the right side 見 suggests seeing or observing. Picture a calligrapher carefully watching the stone as they grind ink on it: 硯 is the inkstone.
For ケン, imagine a calligrapher named Ken who always uses his favorite inkstone: Ken -> ケン, and the stone is ready for grinding.
inkstone
inkstone well
event where schoolchildren wash their inkstones, brushes and desks the night before Tanabata to pray for success in their studies
inkstone
inkstone case
showing unyielding diligence in one's studies; wearing a hole through one's metal inkstone from constant studying
writing brush and inkstone