Portfolio Sixties Art / 1967 Netherlands - Tjebbe van Tijen - Rain Concert (This concert can only take place on rainy days, inflatable head costume for fifty heads, the structure has inflatable ribs that tension the outer skin, contact microphones pick up the rain sound, the amplified sound is played inside the head costume through loudspeakers, the audience remains dry in the rain and can relax and concentrate on the rain sound.)