The empty chair technique was initially introduced by Fritz Perls and developed by Edgar Stuntz (White, 2023). In this technique, the client is made to sit on a chair and consider the empty chair in the opposite as part of their self or another person (i.e. it may be a loved one or even a diary etc.) with whom they have some unresolved conflicts.   https://www.psychologs.com/empty-chair-technique-gestalt-therapy/