I pondered about what made this movie character's disability disappear before our eyes? We are always clear that his spine "is as crooked as a politician" and "he's five little points below normal". Once Forrest runs out of his leg braces, we see him as overcoming his disability and just accept him as a sweet, loveable, gentle, honest soul.
The disability disappears because we look past it. We see the person not the disability. Hmmmmmmmmmmm..........