The phrase used as title for this post, "A cone with a sphere on top" -- from a slightly-mathy poem by Katharine O'Brien (1901-1986), "Einstein and the Ice Cream Cone" -- has caused me to visualize a Christmas tree and so, in this holiday season, I offer it to you. Enjoy! And Happy Holidays!
Einstein and the Ice Cream Cone by Katharine O'Brien
His first day at Princeton, the legend goes,
he went for a stroll (in his rumpled clothes).
He entered a coffee shop --- moment of doubt --
then climbed on a stool and looked about.
Beside him, a frosh, likewise strange and alone,
consoling himself with an ice cream cone.