That's a really cute story! Something you said there actually reminds me of something my dad used to tell me (a little ahead of schedule since it's not quite father's day) when I was a kid. When I, ever inquisitive, asked him why the grass was green, he responded quite matter-of-factly that it was the elves that came out at night with green paint and little paint brushes that painted each blade of grass green. I bought into it too, which put my dad in the awkward position of having to explain to my teacher why I insisted in class that she was wrong and it was elves that made the grass green!