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tokens: ACKNOWLEDGEMENTS We thank the referee for their comments. JPB and AJR acknowledge NSF grant AST-1616598. AJR was supported by National Science Foundation grant AST-1616710 and as a Research Corporation for Science Advancement Cottrell Scholar. We thank A. Ferre-Mateu, A. Wasserman, V. Pandya, L. Chevalier, and S. Bellstedt for their help with the mask design and/or observations. We thank P. van Dokkum, P. Kroupa, and H. Haghi for their comments on an early version of this paper. The data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. This research has made use the NASA Extragalactic Database (NED).