Roulette (curve) in this case, the point lies on the circle then the roulette is a cycloid. A related concept is a glissette, the curve described by a point attached to a given curve as it slides along two (or more) given curves. Formally speaking, the curves must be differentiable curves in the Euclidean plane. The "fixed curve" is kept invariant; the "rolling curve" is subjected to a continuous congruence transformation such that at all times the curves are tangent at a point of contact that moves with the same speed when taken along either curve (another way to express this constraint
Like a Rolling Stone it goes away. You don't know what it means. Except that the ghost picked me to write the song." More than 50 years since its release, "Like a Rolling Stone" remains highly regarded, as measured by polls of reviewers and fellow songwriters. A 2002 ranking by "Uncut" and a 2005 poll in "Mojo" both rated it as Dylan's number one song. As for his personal views on such polls, Dylan told Ed Bradley in a 2004 interview on "60 Minutes" that he never pays attention to them, because they change frequently. Dylan's point was illustrated in the "100 Greatest Songs