A study of the way observable clustering depends on expansion history is reported. Observable shapes that result from evolving otherwise identical systems are intercompared to show differences due to different expansion histories. Four cases are compared: non-expanding, Ω =1, and two open universes with 0.10 and 0.03 as final values of Ω There is remarkably little difference in observable forms for the expanding cases. The 0.03 universe expanded by a factor 500 during the experiment. This study is an example of the way numerical experiments can be used is studies of galaxy clustering.