A day with some blind and partially sighted walkers has shown me how much I barely notice – and how hard it is to find the right wordsHow many shades of green are there? Whatever the answer may be, I soon ran out of words to describe them. I was walking north along the Grand Union canal, trying and failing to adequately describe what I could see, to a friend who couldn’t. This was Dave Heeley, ultra-runner, who in 2008 became the first blind person to run seven marathons on seven continents in... Read this story
