The Füssener Sternfreunde’s modular planetarium is a
high-quality, handcrafted educational tool for displaying the starry sky. It is characterized by its robust construction and is often used for astronomical educational purposes.
Here are the key facts:
    Materials and Construction: The planetarium is solidly constructed from birch plywood and brass. It is a utility model-protected design.
    Function: It allows for the display of the ever-changing night sky and is highly engaging, making it particularly suitable for use in schools (all age groups).
    Background: It was developed by the Füssener Sternfreunde, a dedicated group that is deeply committed to promoting astronomy education in the Allgäu region and neighboring Tyrol.
https://www.spektrum.de/.../medi.../375/Steckplanetarium.pdf