Glowing Stones
Famously, there are two main traditional understandings for the word צהר (Tzohar) used with regards to the description of the Ark: 1. Window. 2. Glowing gemstone used for light. Presumably, the second interpretation is based on a wordplay on זהר (Zohar), which means "glow" or "aura". However, I admit that the logic of the second interpretation was never clear to me. Glowing gemstones are for movies and comics, right (at its base form, you draw the gem and add radial lines around it) ? Wrong! As it turns out, multiple sources from the Roman, Byzantine and early medieval periods, both Jewish and non-Jewish, record the existence of various types of stones that glow in the dark. Rabbi Prof. Daniel Sperber wrote an article on the topic over 40 years ago. And, there is even a Wikipedia article on luminous gemstones . The wiki article dismisses most such sources as unrealistic (as it is often wont to do). I recall, however, seeing sometime in the past, a suggestion by a s...