The Imaginarium is a special room hidden in Homnibus' hovel that appears in the Smurfs cartoon show. It consists of a chair and several special crystals that magnify one's imagination and allows that person to share his imagination with others in the room. In the cartoon show episode "Papa's Day Off", Homnibus allowed Papa Smurf to use the Imaginarium to see what his little Smurfs would do in an emergency situation if he wasn't there to take care of it.
The Dream Machine is a possible updated analog of this idea for the Smurfs comic books.