This is great stuff, in a great book by a great writer. Read Cryptonomicon first if you haven’t already, it’s fantastic.

Invocation

State your intentions, Muse. I know you’re there.
Dead bards who pined for you have said
You’re bright as flame, but fickle as the air.
My pen and I, submerged in a liquid shade,
Much dark can spread, on days and over reams
But without you, no radiance can shed.
Why rustle in the dark, when fledged with fire?
Craze the night with flails of light. Reave
Your turbid shroud. Bestow what I require.

But you’re not in the dark. I do believe
I swim, like squid, in clouds of my own make,
To you, offensive. To us both, opaque.
What’s constituted so, only a pen
Can penetrate. I have one here; let’s go.

—Neal Stephenson in Quicksilver