The word got its importance in spiritual circles, where it was believed that people in great distress can make a hologram of himself - even thousands of miles away. It can be a call for help, or just to connect with the family in the person's last breath in an accident.

Spiritualists are actively working with this dobbelgänger, for example during seances.

A dobbelgänger can appear as a mist, shadow, incomplete entity or as a full-body entity, and it is reported that people are able to communicate with them.
 
Watercolor painting, showing couple meeting their Dobbeltgänger
Watercolor painting, showing couple meeting their Dobbeltgänger