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  L1: Pendulum wave, Plastic
      displacer, Mechanical wave
      drivers










  L2: Whistle, Recorder, Singing
      bowl, Decibel meter,
      Standing Wave String,
      Slinkies








  L3: Xylophone, Resonant
      boxes for tuning forks,
      Band-aid speaker, Falling
      bead wave, Straws, Tuning
      forks, Mallets





  L4: Wave demonstrators




  L5: Sound tubes, Organ pipes,
      Sliding organ pipe, Glass
      singing tubes, Large sewer
      pipe