I would imagine that many years ago, real horse hair was used, but the stuff sold in stores now is man made.. (acolourfulcanvas.com)
The artist has been using organic materials since 1990s, such as horse hair, skin, wood, wax, and many others as a starting point to produce disturbing and alienated sculptures. (vernissage.tv)
As far as hanging things on the walls, I must plan because they are the original horse hair plaster walls. (theinspiredroom.net)