Conclusion

Quantum modal realism is a strange and unfamiliar doctrine. That is not by itself a reason to disbelieve it. Physical reality has continually turned out to be larger than we imagined possible; quantum modal realism expands reality one step further, beyond the actual world. In this short conclusion, I trace the history of human beliefs about the size of the cosmos, and compare the expansion of our horizons that results from quantum modal realism to previous revolutions in cosmology. I also observe that in some ways quantum modal realism is economical; while it may expand our conception of reality, it does not expand our conception of what is possible or of what is actual.