"Where do you ride, sir?" asked one of his pupils, after vainly striving with reins and whip, knee, heel and spur to execute a movement which the master had compelled his horse to perform while apparently holding himself as rigid as bronze.

Beautiful and impressive contrasts meet you everywhere: the colors of tree and flower, rock and sky, light and shade, strength and frailty, endurance and evanescence, tangles of supple hazel-bushes, tree-pillars about as rigid as granite domes, roses and violets, the smallest of their kind, blooming around the feet of the giants, and rugs of the lowly chamaebatia where the sunbeams fall.

Motion is as rigid as marble, if you only take a wink's worth of it at a time.

However, the laws of life are as rigid as mathematics.