Let us investigate. The video shows a pair of three-armed stars, each supporting a weighted
lever to the left, as shown in Fig. 1. The two stars are one behind the other, with their
centers vertically displaced a distance h, as shown in Fig. 2. At the tip of each lever, there is
a link (of vertical length h) that joins the two stars, keeping their rotations in synchronism.
This link also has a horizontal dimension equal to the horizontal separation between the two
stars. A "ag" is attached rigidly to the horizontal leg of the coupling link, so that as the
entire assembly rotates, the ags all remain horizontal at all times. Fig. 1 shows a typical
1
position, displaced from having any leg straight up. In Fig. 2, one third of the complete
assembly is shown, consisting of adjacent arms of each star and the link and ag connection
between the two of them.