London Underground

a photo exhibition celebrating 150 years of the Tube
exhibition information, sponsors and publications

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Emergency Helix

x = r cos t, y = r sin t, z = ct
Right-handed spiral, Oval station. Equisolid angle fisheye projection.
©Yangchen Lin | Singapore Airlines inflight magazine

yangchen lin london underground spiral staircase yellow stairwell stair curve oval station tube subway metro emergency exit helix helical northern line fisheye tube150 photo exhibition