The Carnelian Cube by de Camp Sprague L, Pratt Fletcher

THE DREAM STONE
Arthur Cleveland Finch was a practical man, the staunchest of citizens...but when he slept with the ancient cube of red stone under his pillow, he woke to a world where practicality seemed to be against the law. Finch found himself a poet in a country where poets were highly valued...and where a man could be arrested for reciting a poem in public!
Fleeing for his life, the magic of the carnelian cube carried him from world to world...and each world proved more fantastic and more dangerous than the last!

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