Are you on the good stuff or something? It's black. Just because someone muttered "quantum" does not make this magic. It's black. What is so complicated about this concept? It literally can not get much more normal than this.
This is gibberish. Unless you're high on acid, when you see a black thing, your visual system does not go nuts trying to fill in the missing data... it sees black.
You're trying to explain a phenomenon that doesn't exist. Your brain does not see a black object as a "gap"... it sees it as black. There's nothing complicated to explain here. There's no "illusion". There's no weird perceptual thing to explain, beyond the usual "what is seeing red, really?" (red for some reason being the usual color chosen for this question), which is clearly not what is being referenced. There's no gap here. No optical illusion. Just black.
I mean, find something in your visual field that is black, and look at it for a bit. Do you see your brain "filling in the void, perhaps with a fuzzy version of continuity of whatever colors and textures surround the object"?
The only hard thing about understanding this is that there's no hard thing.
If the brain receives noise, it fills in the blanks (http://www.sciencedaily.com/releases/2000/06/000601164617.ht...). In sensory deprivation, the brain also fills in the blanks (would cite but ended up finding a ton of supporting material in a web search, including an interesting study about the effects of anxiety on amount of hallucinations).