Arne Jacobsen was a Danish architect and designer famous for his furniture designs of the 50's, such as the iconic egg chair.
Jacobsen created the egg chair and swan chair as part of designing the SAS Royal Hotel in Copenhagen from 1956-1960. Jacobsen was a proponent of proportion, as is seen in all of his designs, including the egg chair.
Though always a classic, the egg chair has recently once again experienced a surge in popularity, with new takes on the fabric or leather covering. I've noticed that Restoration Hardware has their version front and centre in their Fall store display.
Here are a few others that are pretty groovy.
Gotta keep my eyes open for a vintage one...