"The sculptor Lorenzo Ghiberti had laboured for fifty years to create the bronze doors of the Baptistry, which Michelangelo was to describe as 'The Gates of Paradise'.":
http://shelf3d.com/i/Michelangelo%20Buonarroti
I found this factoid on this interesting page in search of a most memorable event that happened in the year 1546 as a way for me to remember my Human Design Gates 15 and 46 where I have Sun activations in my G/Ji/Self Center [1]. I think I'm off to a good start on my objective here!
Also in the same piece on Michelangelo:
"It is certainly a miracle that a formless block of stone could ever have been reduced to a perfection that nature is scarcely able to create in the flesh."
[1] "G" is the one "term" in the Human Design System that up till now
I was not certain as to whether or not it might stand for something and that is abbreviated with just the letter "G". Here is an article on that:
http://www.humandesignsystem.com/archive/newsletters/1606.html#title1
I like to think of it as "Galactic". Therefore I can refer to the Center as my: "Galactic Self Center"! ; - )
