城

1. Origins, structure, and basic meaning

• Structure: 城 is a noun read しろ, meaning a castle. In an appropriate play context, it can also refer to a castle-shaped structure made of sand.
• Basic usage: A real castle may be described by its location or visibility, while a play structure is identified through context such as a beach and the act of building.
  • 丘の上に古い城が見える。 says that an old castle is visible on the hill; 子どもたちは砂浜に大きな城を作った。 describes children building a large sandcastle on the beach.

2. Common pitfalls and similar expressions

• 丘の上に
  • に marks the hilltop as the castle's location; it does not mark the viewer or the direction of sight.
• 砂浜に城を作った
  • The beach setting makes 城 a sandcastle built by children rather than a full architectural castle.
• 城 and 城跡
  • 城 denotes the castle itself, while 城跡 denotes the site or remains of a former castle.