He was an apt scholar and gave striking evidence of ingenuity. While walking on the seashore he picked up the spine of a fish. Imitating it, he took a piece of iron and notched it on the edge, and thus invented the saw. He put two pieces of iron together, connected them at one end with a rivet, and sharpened the other ends to make a pair of compasses. How do the context clues in this paragraph help the reader understand the meaning of ingenuity?