I've had a look back at a previous article of mine about missing people, and how it has sidetracked to people with disabilities. This got me thinking about some of the work I do with people with disabilities that mean they are wheelchair bound, or require a wheelchair for long distances. Has anyone else noticed the weird phenomenon of wheelchair blindness? No, this is not actually a disability, but something I have noticed the public seem to have when confronted by someone in a chair. It'...