The holocubes were created by Mysterio to project realistic looking 3D holograms.
Mysterio created the holocubes to project life like images over a large area.
The first time Mysterio used the cubes he made it look like the roof of the Metropolitan Museum was caving in.
Mysterio would use them several times in his various crimes.
- The Holocube was original to Spider-Man: The Animated Series.