Lucky for Zooey1118, I know exactly what chairs they are! Want to find out?
Good pick! The chair is called the Swan Chair. It was designed in 1958 by noted Danish architect and designer Arne Jacobsen. It was originally created for the SAS Royal Hotel in Copenhagen, for which Jacobsen was the architect. The chair's swivel base was intended to allow guests to spin and participate and in the busy hotel atmosphere.
A new version of the chair in that elegant walnut leather will cost you $8,088 from Design Within Reach. But you can order one for as little as $3,678 from Hive Modern. Your best bet for a more affordable purchase is to buy one secondhand from Craigslist, a thrift store, a flea market, or an antiques shop.