Stripe is pondering such concepts stumbles upon a mass of other caterpillars that seemed to be purpose-driven. The other caterpillars were moving toward a type of caterpillar-pillar, in which many of the animals had formed a living mass that grew upwards, reaching into the clouds and out of sight. Stripe decides to follow the rest of these creatures, essentially deciding that his purpose in life should be, like his fellow caterpillars, to reach the top of the pillar. This is identical to our own human beliefs in purpose in that Stripe has, like us, placed his “faith” in some purpose. This story displays how one may doubt this faith, but that faith is ultimately necessary.
After a long while of climbing, Stripe meets Yellow in the pillar. Both of them have begun to question their purpose in climbing to the top of the tower; they have a short conversation about this doubt.