What is a three-way bottle in Feng Shui?

The three-in-one bottle combines an ink bottle, an inkstone and a pen holder into one. It is characterized in that: the top of the bottle body has a closed plane, and there is a concave inkstone pool on the plane. There is a funnel-shaped ink outlet near the inkstone. There is a bucket with a one-way valve at the bottom of the ink outlet. There is a pen holder on one side of the bottle wall.

In Feng Shui, the role of the three-in-one bottle is to help luck, but there are many considerations.