Green

On the radio a long time ago, there was a woman who had been born without eyesight. She was given an operation that allowed her to see for the first time ever. When she got home, her helper-dog leapt up at her: it realised she could see, because they are not allow to do that with an unsighted person.
The interviewer asked her what the best thing was that she had ever seen. 'Grass', she replied. 'I had no idea that there was so much green and that it was such a beautiful colour. How can anybody be unhappy when there is so much green in the world to look at?'.