Hence the appearance of two sets of frequencies. The description of the full spectrum would imply solving the equation of a partial Winkler foundation (see [22]). The method of dropping a coin onto a block produces a different set of frequencies caused by the edge of the coin spinning on the block. The fourth method (coin hanging by a thread) and hit with a heavy metal rod produces good results. Furthermore, it seems that it is possible to activate specific modes by hitting the coin in given places.