Copenhagen Castle Pot. It is called the Castle Pot since it is inspired by a pot made at the royal Danish castle of Fredensborg in 1860. Over time, production moved to smaller potters in Copenhagen, where it was made until plastic pots began to grow in popularity in the 1960s. Steffen Berg found his inspiration in a beautiful pot he saw years ago in a former nursery. Just outside of Copenhagen, in the historic fishing village of Dragør, there is a unique interplay between the blue sea, the ornate houses and the shiny green gates of the paved avenues.