The Atlas is a (domain × form) matrix — two cyclic axes, so its true shape is a torus. Around the hole runs the form axis: one form is a ring around the tube, the same computation worn by every field that carries it — that ring is a bridge. Around the tube runs the domain axis: one domain is a ring the other way, its span of forms. A torus has no center and no edge — which is the honest shape now that the map is one connected body, nothing central and nothing peripheral. Drag to turn it (or let it drift). 408 calculations · 63 domains · 39 forms · 39 form-bridges.
Found and mapped, never generated. The shape is not imposed: forms genuinely wrap across domains and domains across forms — two circles, and two circles make a torus. Selecting a point shows the one calculation living at that (form, domain) cell.