  We discuss an experiment conducted by Nesvizhevsky et al. As it is the first
experiment claimed to have observed gravitational quantum states, it is
imperative to investigate all alternative explanations of the result. In a
student project course in applied quantum mechanics, we consider the
possibility of quantummechanical effects arising from the geometry of the
experimental setup, due to the "cavity" formed. We try to reproduce the
experimental result using geometrical arguments only. Due to the influence of
several unknown parameters our result is still inconclusive.
