In a room the size of a ballroom the Pattern was laid. The floor was black and looked smooth as glass. And on the floor was the Pattern. It shimmered… - Roger Zelazny

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In a room the size of a ballroom the Pattern was laid. The floor was black and looked smooth as glass. And on the floor was the Pattern.
It shimmered like the cold fire that it was, quivered, made the whole
room seem somehow unsubstantial. It was an elaborate tracery of bright power, composed mainly of curves, though there were a few straight lines near its middle. It reminded me of a fantastically intricate, life-scale version of one of those maze things you do with a pencil (or ballpoint, as the case may be), to get you into or out of something. Like, I could almost see the
words “Start Here,” somewhere way to the back. It was perhaps a hundred
yards across at its narrow middle, and maybe a hundred and fifty long.
It made bells ring within my head, and then came the throbbing. My mind recoiled from the touch of it. But if I were a prince of Amber, then somewhere within my blood, my nervous system, my genes, this pattern was recorded somehow, so that I would respond properly, so that I could walk the
bloody thing.