Although not as pronounced as Shakespeare's portrayal of the king as ahunchback, the condition would have given the adult male the appearance of having one shoulder higher than the other.
Shakespeare and others have characterized Richard III as ahunchback, and the body found among the remains of what was once a monastery shows signs of scoliosis, or curvature of the spine.
Like the Hunchback of Notre-Dame or the Phantom of the Opera, Hugo lives a secret life in a public place a rubbishy room up in the clockworks, where he tinkers with inventions old and new.
Most people are only familiar with the vengeful, manipulative hunchback that Shakespeare portrayed, but groups like the Richard III society see that as a distortion or flat-out-lie.
In the 1920s Homo erectus distorted himself a bit, and took to swinging round church towers or chandeliers as the Phantom of the Opera and the Hunchback of Notre Dame.