pushed through the holes 34 in contrast the holes 30 in the upper end of the pendulum arm 18 are oversized to be received by hooks 40 hanging from a bracket 28 the body of the pendulum arm 18 in horizontal cross section has a greater transverse dimension 42 than longitudinal dimension 44 and this in combination of the transverse orientation of the holes 30 and 34 provide that pendulum arms 18 preferentially allow motion along lateral direction 20 and resist other modes of reciprocation referring now to fig2 it will be understood that the hanger bar 16 and pendulum arms 18 together form a pendulum having a natural period of reciprocation dependent as a first order only on the length of the pendulum arms 18 accordingly different weights and amounts of clothing on hangers 24 may be supported from the pendulum arm 18 without substantially upsetting the frequency of the oscillation the ability of the hangers 24 to swing in the holes 22 further decouples the hangers from the hanger bar 16 more generally the hanger bar 16 may be mounted in any center biased arrangement for example using springs or the like so that resonant excitation will cause it to reciprocate such mass spring systems however do not have the advantage of the pendulum system in being indifferent to the weight of the garments referring still to fig2 each of the pendulum arms 18 provides for pendulum motion of its lower end about its upper end attached to the ceiling 14 of the cabinet this causes reciprocation in lateral direction 20 of.