What was the real shape of the Menorah? What should be the shape of the Chanukiya? (Chanukah and Parshas Truma)

What kind of Chanukiyah should be used?

Also:
1. Why does the Rambam depict a different Menorah than everybody else?
2. Why are the cups on his Menorah upside down?
3. What is the purpose of these cups?
4. Why did the Rebbe request that “Public lightings” of the Menorah be performed in every public area in the world?
5. What’s wrong with having “round” branches?
6. Why should a Chanukiya be with straight (not round) branches?
7. A historical gathering at the Arch of Tito in Rome.
Based on Likutei Sichos Vol. 21 pages 164-172 and others