What does it mean to know something by heart?

We’re saying that words—our own or a colleague’s or a piece of oral tradition—matter enough to be remembered. Known by Heartdelves into the contemporary value of memory and the act of memorization.  I’m curious about what it takes to make something memorable.  What is the difference between something stored

An image I use to help me remember an E.E. Cummings poem. More on that later

in external memory — a book, a piece of paper, a thumb drive, an SD card– and something stored inside us– in our neuronal pathways, in our hearts? What’s the difference between a poem written for the printed page and one written to be memorized and presented as spoken work? As I figure it out, I’ll let you know.