A convolution reverb uses recordings of a reflected sound (e.g. a gunshot) in a room or space, thus creating super realistic reverbs. However, you can also use any sound file to create spaces that will never exist in real life.
In this video, I’ve been using the new ‘angel hair’ Morphagene reel which was recently posted by MakeNoise to create rooms which were originally sliding windows, toy trucks running from a playground ramp and crushed angel hair spaghetti falling down on a vibraphone. Rings and Strega were used as voices, Desmodus Versio provided some regular reverb when ECR-1 was doing the unreal rooms.
You can download the reel here: https://freesound.org/people/makenoisemusic/