Come to think on it, sand really isn't gritty. It is very smooth and silky. Living in So California, I practically lived at the beach during any spare time. Everyone walks on the beach without shoes. But I like your creative thinking. The suggestion on checking with a major site regarding blind children is an excellent suggestion. Good Luck. I remember one of my Dad's friend had a little girl that was my age. I enjoyed reading to her. I was very young and that is all I remember. Good Luck !!