From Ulrika Kestere's Girl With Seven Horses series:
Once upon a time there was a girl who had 7 invisible horses. People thought she was crazy and that she in fact had 7imaginary horses, but this was not the case. When autumn came the girl spent a whole day washing all her clothes. She hung them on a string in her garden to let the gentle autumn sun dry them. Out of nowhere, a terrible storm came and its fiercefull winds grabbed a hold of all her clothes and all seven horses (authors note: since they are invisible they obviously didn't weigh much). The girl was devestated and spent all autumn looking for each horse spread around the country, wrapped in her clothes.