If you prefer a genuine classic as opposed to an Ikea copy, how about something that screams the 1960s – the Eero Aarnio Bubble Chair.
It was introduced in 1968, very much in the style of the Ball Chair, but a little more stripped down. The idea was to make a chair that allowed in the light, but swallows the sound – so you still feel isolated from the outside world. The shell is made of acrylic, with a chromed steel bar around the edge. There’s also a two metre chain and hooks for hanging and a silver fabric or leather inside cushioned seat.
You can still buy the Bubble Chair, but it’s not cheap. An officially-sanctioned version should cost you around £2300.