The Rail is by Cleveland-based product designer Brian Hendricks, a/k/a Lofted Goods. It’s a rail-based, wall-mounted planter system consisting of a wood dowel and 3D-printed components.
The vessels are easily removable, and slot into the brackets via a sliding dovetail.
The bottom of each vessel is unscrewable, allowing you to drain water as necessary.
What I really appreciate is that Hendricks put careful thought into how the system could be easily installed and assembled:
Hendricks doesn’t sell The Rail as a product, but posts the files here so you can 3D print it yourself.