These ballet dancers are spinnings tops made by the Canadian manufacturer foreverspin
. All have identical size and shape, thus the individual mass varies with the density of the used metal. These dancers were made from aluminum (Al, ρ = 2.7 g/cm3
), zirconium (Zr, ρ = 6.52 g/cm3
) and humanium
(Hu, ρ = 7.94 g/cm3
), respectively. Therefore Humanium
has the best stamina for spinning and transmits the strongest impulse on its peers.Snapshots of their performances
are found in the gallery.