>>16741727
>[W]hat is mathematically interesting about it?
How about the following?
LS = line segment

The length of every light green LS is 2*sin(pi/7) ≈ 0.868.
The length of every purple LS is 4*sin(pi/7) ≈ 1.736.
The length of every other LS is 1!

Each purple LS is parallel to its corresponding light green LS.
Each central dark green LS is parallel to its corresponding light green LS.

The coordinates of the four bottommost points are so complicated, that wolframalpha.com wasn't able to find their exact values!

Unfortunately, the graph is vertically elongated.
Because grok.com didn't use square graph paper.