 Especially given the widespread use of ‘fundamental’ as equivalent to ‘ungrounded’, it seems plausible that there might be some intimate link between naturalness and grounding. So far, however, most discussions of naturalness and grounding tend to treat the notions as being in some sense rivals (see, e.g., Sider  2011,  ch. 8), so there have been few attempts at systematic theorising using both together. Here are some generalizations that seem worth considering: