Through seeming short byways and flowery delves
To dread DOUBTING CASTLE where cruellest of fates
Through GIANT DESPAIR the traveler awaits.
In GEOMETRÍO'S most wondrous GUIDE-BOOKS
At first one is puzzled if he only looks
At Guides of this Giant who many forms wear,
Some angular figures and others quite square;
Some round like a bullet or like cubes or cones,
But each of these figures some great power owns.
And Geometrío will tell all who ask