Visual artist Liliane Lijn used her signature conical shape, which she calls a koan, for a slide installation at the Evelina Children's Hospital in London.
"The difficulty in making a work of art that is at the same time a functional children's slide, is in creating both without compromising either. My concept of sculpture is that no part of it should be unnecessary. I wanted to design a slide that both in concept and form would be an integral part of the sculpture."
Lijn has a wide-ranging and innovative body of work, including her fascinating collaborations with astronomers as part of a residency at the Space Sciences Laboratory at the University of California, Berkeley. Take some time to peruse her website.