Depending on how you observe them through space and time; every line can be seen as a circle and every circle can be seen as a line.
In this version of the Tree of Life all the paths are also drawn as circles to show what kind of patterns could be created by depicting the pathways as waveforms instead of just linear lines, and then combining them together with the nine fundamental circles used to define the Tree of Life graph, and the smaller circles used to define the volume of the Sephiroth.
