The number of times a stone will skip is correlated with the weathering quotient. Fluvial or wave erosion increases “Y”, the “Skip Factor.” Landscaping and indoor fountain rocks have high “Y” because they are collected in river beds. Salt would corrode machinery, if coastally collected.
The angle of maximization for bouncing is holocene, and ones which don’t bounce, sink because of their hologram angle.
High Y = High Symbolism, because “Life has hard knocks.” It is the knocking against other rocks that smooths stones to gracious curves.