Why did the shoes fall out of the sky in the book holes?

In the book "Holes" by Louis Sachar, the shoes fell out of the sky because they were thrown from a bridge by a character named Clyde "Sweet Feet" Livingston, a famous Baseball player. The shoes were intended for a charity auction, but when they hit the ground, they landed near Stanley Yelnats, the protagonist, who was wrongly accused of stealing them. This incident sets off a chain of events that leads Stanley to Camp Green Lake, where he is forced to dig holes as part of his punishment. The shoes symbolize fate and the interconnectedness of the characters' stories.