Os recomiendo el vídeo del proyecto sobre todo porque resume bastante bien la intención y el funcionamiento de este proyecto de Guerrilla Subways Projection , es como un graffiti audiovisual muy bueno.

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Parasite is a projection-system that can be attached to subways and other trains. Using the speed of the vehicle as parameter for the projected content, the projection starts with the train moving inside a tunnel.All along their journey, travellers see images mysteriously appearing through the train windows: words, aquatic animals, etc. Confusing the routine of your train-travelling-journey, your habits and perception Parallel allows you a glimpse into a different world full of surrealist imagery

el video aquí
web del proyecto aquí