揺り椅子

1. Origins, structure, and basic meaning

• Structure: 揺り椅子 (ゆりいす) is a chair designed to rock back and forth. 揺り椅子で marks a reading position; 揺り椅子が動く makes the chair the moving subject.
• Basic usage: A grandmother reads in a rocking chair by a window; an old chair moves slowly because of the wind.

2. Common pitfalls and similar expressions

• Chair used by a sitter and chair moving as subject
  • The first で marks a place or instrument for reading; the second が predicates movement of the chair itself. The rocking function is built into the lexical concept.