A cerebral secretion that enables one having it to know a house from a horse by the roof on the house. Its nature and laws have been exhaustively expounded by Locke, who rode a house, and Kant, who lived in a horse.
His understanding was so keen
That all things which he'd felt, heard, seen,
He could interpret without fail
If he was in or out of jail.
He wrote at Inspiration's call
Deep disquisitions on them all,
Then, pent at last in an asylum,
Performed the service to compile 'em.
So great a writer, all men swore,
They never had not read before.
- Jorrock Wormley