There's lots of literature about the loss of innocence, because we all share in that loss and literature is about what we share. Here's a poem by Alexandra Teague, a San Franciscan, in which a child's awakening to the alphabet coincides with another awakening: the unsettling knowledge that all of us don't see things in the same way.
The carpet in the kindergarten room
was alphabet blocks; all of us fidgeting
on bright, primary letters. On the shelf
sat that week's inflatable sound. The th
was shaped like a tooth. We sang
about brushing up and down, practiced
exhaling while touching our tongues
to our teeth. Next week, a puffy U
like an upside-down umbrella; the rest
of the alphabet deflated. Some days,
we saw parents through the windows
to the hallway sky. Look, a fat lady,
a boy beside me giggled. Until then
I'd only known my mother as beautiful.