Where Richard Skinner's previous pamphlets, Invisible Sun and Dream into Play, were primarily concerned with the play of light and playfulness respectively, White Noise Machine is mainly concerned with sound. A white noise machine is a device that produces a noise that calms the listener, which in many cases sounds like a rushing waterfall or wind blowing through trees, and other serene or nature-like sounds and Skinner has used this idea to try to create this effect in many of the poems.