Note to Romeo and Juliet, 5.3.84: "A grave? O no! a lantern"

Romeo and Juliet,
Act 5, Scene 3, line 84.
The sort of "lantern" that Romeo is thinking of is designed to let in as much light as possible, no matter the time of day.

Santa Maria Maggiore, cappella sistina cupola

By Sailko (Own work) [GFDL, CC-BY-SA-3.0 or CC BY 2.5], via Wikimedia Commons