Much like the shape of an Eye ball the crystal ball is. Using a crystal ball for observation, one could learn much about the nature of eyesight!!! Behold! Big Crystal balls for learning sensation!
Sources Cited:
14.6. Kepler and Optics - ScienceDirect
The Galileo Project | Science | Johannes Kepler (rice.edu)
Eyeglasses History - Origins of Glasses and Sunglasses
Farsightedness - Symptoms and causes - Mayo Clinic
Vision: Crash Course A&P #18 - YouTube
presbyopia - Bing
Choroid eye and choroid plexus function and choroid plexus tumors (healthjade.com)
Kepler’s optics without hypotheses, Synthese | 10.1007/s11229-011-9977-6 | DeepDyve
Physics - Optics: Refracted Surface (4 of 5) Glass Ball - YouTube
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