Dejima , sometimes also written as Decima or Dezima -RCB- -RCB- was a small fan-shaped artificial island in the bay of Nagasaki . It was built in 1634 . Dejima , sometimes latinised as Decima or Dezima -RCB- -RCB- was a small fan-shaped artificial island built in the bay of Nagasaki in 1634 .