Lines should be straight but with lower side longer than upper side because of the orthographic projection.
Similar to above but with solid interior and curved upper and lower boundaries because boundaries of geoJSON files interpolated along great circles.
Two regions with separate IDs and coloured interiors.
Four regions including region with hole and coloured interiors.
As above but as a mesh instance
As above but as an interior mesh instance
As above but as an exterior mesh instance
London Boroughs with features shaded, exterior mesh in black and interior mesh in red