石塀

1. Origins, structure, and basic meaning

• Structure: 石塀 (いしべい) is a wall built of stone. 石塀が囲む makes it the enclosing subject; 石塀には makes it the surface where moss appears.
• Basic usage: A high stone wall surrounds an old mansion; moss stands out on the wall after rain.

2. Common pitfalls and similar expressions

• Wall enclosing property and surface revealing moss
  • The first shows the wall's spatial function; the second its surface condition. には topicalizes the area where moss is visible.