The oculus was covered during WWII and remained covered for over 75+ years. In 2013, it was renovated using special “Fresnel-like” glass blocks which focus 15-percent more light into the space below.
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Posted to Student Prank Covers MIT Great Dome with Captain America’s Shield
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Image by King of Hearts from Wikimedia Commons via Monolithic Dome Institute (CC BY-SA 3.0)