# Light reflecting off Christmas-tree balls

• Published in 2010
In the collection
'Twas the night before Christmas and under the tree Was a heap of new balls, stacked tight as can be. The balls so gleaming, they reflect all light rays, Which bounce in the stack every which way. When, what to my wondering mind does occur: A question of interest; I hope you concur! From each point outside, I wondered if light Could reach deep inside through gaps so tight?

### BibTeX entry

@online{item17,
title = {Light reflecting off Christmas-tree balls},
author = {Joseph O'Rourke},
url = {http://mathoverflow.net/questions/50150/light-reflecting-off-christmas-tree-balls},
urldate = {2012-04-08},
abstract = {'Twas the night before Christmas and under the tree Was a heap of new balls, stacked tight as can be. The balls so gleaming, they reflect all light rays, Which bounce in the stack every which way. When, what to my wondering mind does occur: A question of interest; I hope you concur! From each point outside, I wondered if light Could reach deep inside through gaps so tight?},
comment = {},
collections = {Easily explained},
year = 2010
}