A metal water pipe attached to the wall well above head level describes a complete circle before spiraling on itself and completing its journey at the shower head, located in the very center of the circle. If you want a shower curtain, all you need to do is to hang it from the water pipe, which doubles as a curtain rail: it could hardly be any simpler.
Ah! Cleverness and elegance in the solution! Why have two things when you can accomplish the objective in one? Designed by Matteo Thun & Partners, this shower head + curtain rail combo would certainly add an element of interest in your bathroom.