Patterns in deep bed of fine glass beads vertically vibrated at frequencies under 50 Hz. All data are produced by fixing a frequency at a low acceleration and slowly increasing the acceleration until the recorded transitions are observed. Most transitions appear to be hysteretic, and transition values produced by decreasing the acceleration are not reported here. Error bars represent estimated uncertainty associated with the bed response. The inset snapshots are taken from top views of the surface; the downhill direction is toward the bottom right corner of each inset.