Imagine you've lost your favorite toy and you really want it back. So you decide to write a note to the universe and send it up to the sky hoping that someone or something up there can help you find your toy. That's kind of like what a "himmelsbrief" is all about.
A himmelsbrief is a letter that people would write in the past to ask for help from heaven or the sky. They would write the letter on a piece of paper, fold it up, and attach it to a helium balloon. Then, they would release the balloon into the sky and hope that their letter would be received by a higher power who could help them.
People believed that the balloons would fly up to the heavens, to the gods or angels, who would read the letter and then work to help the person who wrote it. Sometimes, people would even include special prayers or requests for protection in their himmelsbrief.
Nowadays, we may not write himmelsbrief anymore, but we still have ways to connect with the sky and our universe. We can use modern technology, like satellites and telescopes, to learn more about what's up there in the sky. And we can still send messages into the sky through things like fireworks or even point a laser pointer up towards the stars.
So, even though himmelsbrief may seem like an old-fashioned way of asking for help, its spirit lives on in our modern world.