 A number of objections have been raised against constitution views. One is an objection from causal overdetermination. Another is an objection from grounding. Consider a statue allegedly constituted from a statue shaped piece of clay. Someone throws the statue against a pane of glass, which breaks. What caused the glass to break? Surely, the statue impacting it. But the glass was also impacted by the statue shaped piece of clay with sufficient force to break it. So, if constitution is not identity, the glass breaking has two causes. Some would say that is one cause too many.