Nephelococcygia word comes from Aristophanes' play The Birds. This in greek means "Cloud Cuckoo Land", a utopian city in a cloud of the main character to persuade all the birds of the world to build.
Cloud gazing, or sky gazing, can be a fun way to pass the afternoon hours. More than fun, though, I've found it to be incredibly relaxing. It's getting a bit cold out to do it lately, but it's a favorite spring/summer tradition.
For these types, who were then enthusiastic when they heard the stamp collection was the name ( "Philately"), you'll be pleased to know that there is a technical term increase Nephelococcygia cloud.