The Schwa was here

Calvin Schwa is one of those kids who doesn't get noticed, even when he's standing in the middle of the boy's bathroom singing "God Bless America" while wearing an orange sombrero and a cat costume. When Antsy Bonano does finally notice him, the decide to test the "Schwa Effect," then to make some money from it. They go one dare too far, however, and end up doing penance to a crabby, rich old man with a beautiful blind granddaughter.
Fun aside, though, not being noticed can be tough, especially for the Schwa, whose mother disappeared when he was five and whose father seems to be out in space most of the time. As Antsy learns more about the Schwa's miserable life, he's determined to be the one who notices. But the Schwa has something more dramatic in mind.

When reading this book I used determining the importance and visualization while reading this book

The author of this book is Neal Shusterman