[en] It is proposed that spicules are the direct result of a resonant buffeting of the sides of an intense (kilogauss) slender flux tube by turbulent granular motions. For a critical wavespeed, the granular motion drives a high-speed flow along the axis of the tube. This effect is illustrated by considering in detail a flux tube embedded in a uniform compressible atmosphere, thereby modelling the development of the 'seedflow' in the photosphere that eventually manifests itself in the chromosphere as the spicule. (Auth.)