I expect a bunch of mathematical and geometric convergences in this challenge. In the absence of getting a good picture of the Nexus, or Soran‘s attempt to enter it, I went with something a little more spiritual. Also, I really like blue.
This glass window above the transom at the Abbey Church at the Monastery of the Holy Spirit represents the challenge best. Stepping through the doors into a sacred space is a convergence, from the finite to the infinite, from the temporal to the eternal.