⟪⟪ 23 degree upper pyramidal arc ⟫⟫
A possible display of a 23 degree upper pyramidal arc. It is not the clearest display and only a fragment, but it fits a simulation reasonably well.

[ normal || enhanced ] ⇛ (2016-05-06)

[ normal || enhanced ] ⇛ (2016-05-06)

[ normal || enhanced ] ⇛ (2016-05-06)