Freischwimmer TFL 150 (2013) is a signed archival pigment print by Wolfgang Tillmans, created to mark the 150th anniversary of the London Underground. The artwork belongs to Tillmans' celebrated Freischwimmer series — among the most significant bodies of abstract photography of the 21st century — and carries the official Transport for London 150 roundel, making it a unique intersection of public commission and fine art practice.

The Freischwimmer series, begun in 2003, is made entirely without a camera. Working in the darkroom, Wolfgang Tillmans exposes photosensitive paper directly to a controlled light source — a flashlight — before developing it as a standard colour print. The result is pure light, chemistry, and chance: fluid green forms that shift from deep emerald to luminous aquamarine, evoking water, skin, astronomy, or chemicals dissolving — associations the viewer's brain supplies entirely on its own. As Tillmans has described: "They are photographs made without a camera, purely with light… they evoke all sorts of associations, like skin, or astronomy, or chemicals dissolving, and it's all done by the brain."

The connection between the Freischwimmer images and the London Underground is not incidental. Wolfgang Tillmans had previously chosen the series for a 2011 art campaign on Tube carriages, explaining: "I'd been thinking of the mind wandering off during a Tube journey — eyes closed, drifting out of the crowded city into some aqueous or natural space." This limited edition print extends that dialogue between public transit and private reverie into collectible form. Hand-signed and numbered in an edition of 100, printed on Hahnemühle photo-rag paper.