English: Six pairs of circles that maps onto each other (plus an orange orthogonal circle that maps onto itself) when inverted in the red circle ω. Dashed circles include ω, solid circles do not. The pairs of dashed circles maps onto each other, as does the solid ones, according to colour. The pink dashed circles (γ₁ and γ₁') are concentric with ω. Blue circles intersect ω, green circles are tangent to ω and pink cirkles neither tangent oc intersect ω.