The shadow cast by a simple stick or obelisk allowed ancient people to

The answer to this question is tell the time of day
The shadow cast that used by ancient people will be really dependant on the positioning of the sun that creates a different type of shadows.
This serves a very similar purpose with modern-time clock because the people could predict the time of the day by simply seeing the type of the shadows

Iread this book last year so take this with a grain of salt.gene jumps from the tree to compete with finny due to the fact that gene is always trying to do better than finny. he is put under the grasp of peer pressure due to finny almost forcing him to do this. ever since he first jumped finny kept pressuring him to jump since he thought gene enjoyed jumping.rather than uses this answer you should probably just reread chapters 3-4