Climbing, Climbing

The vast majority of old stories in the sky feature grand quests, brave heroes, vast magics, and a whole lot of dark spirits. Sometimes this means the tales get on the creepier side, sometimes it just means that there's a higher chance of at least one high-stakes battle at the end. Even simple warnings are ominous: don't speak of the malevolent spirits after nightfall in the autumn months, stay indoors after dark, etc.
Even with all this, there are still a few myths that feature spirits of light. These ones roamed the night during spring and summer seasons, granting small gifts, advice, and good luck charms to weary travelers. One of these tales is the story of a young man who, stepping out of his house in the morning, realized that he had forgotten a couple of study books on his roof. (In the sky, many human dwellings have flat roofs, where plants like grass and moss can be grafted into the branches of the building to maintain a small garden or soft perch. The young man in question had been up late studying and didn't want to disturb his family by lighting lanterns in the house).
So, to retrieve his notebooks, he climbed up the side of his house and onto the roof to find a neat stack of notebooks, a couple of apples, and a few strange coins waiting for him. 
Upon closer inspection, the coins turned out to be metal - extremely valuable, and enough to help the young man settle the family debts that his father had acquired. 
The tale was not an isolated incident. Anyone who climbed to their roofs during the early hours of the morning might be blessed to find small gifts from benevolent spirits for them. The higher the building, the greater the gift - and the buildings had to be climbed. No flying allowed; dragons could climb too. 
Eventually, the habit of a quick morning roof check turned into a nursery rhyme for children. To this day, small Skydwellers will chant the rhyme while spiraling around each other in the sky.

Look, look! A shadowy nook!
Betwixt the roof and sky
Climb the side,
Don't you slide
And find the gift so shy

The verses go on in a similar rhyme scheme. There are five in total.