After working on various LEGO spheres, domes and polyhedrons, I finally took the challenge of conceiving and astronomical cupola on top of an astronomical observatory, within which stands a cassegrain-type telescope!
The cupola is fully rotating, and its opening is fully functional and can be operated with a lever.
The telescope is mounted on an equatorial forked mount, with rotations fully functional on its two axis: right ascension and declination.
I attached a small office to the main building and set the environment in autumn, emphasized by the maple trees showing reddish leaves.
The Astronomical Observatory is made of exactly 3000 LEGO bricks.