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
Who breaks a butterfly upon a wheel? version of the quotation as the heading (set in capital letters) for an editorial on 1 July 1967 about the "Redlands" court case, which had resulted in prison sentences for Rolling Stones members Keith Richards and Mick Jagger. The philosopher Mary Midgley used a variation on the phrase in an article in the journal "Philosophy" written to counter a review praising "The Selfish Gene" by Richard Dawkins, where she cuttingly said that she had "not attended to Dawkins, thinking it unnecessary to break a butterfly upon a wheel." The British rock band, The Mission, enjoyed a no. 12 hit in