The catcher in the rye when he say he's disappearing?

In "The Catcher in the Rye," Holden Caulfield mentions feeling like he's disappearing when he imagines himself standing on the edge of a cliff, catching children before they fall off. This symbolizes his desire to protect innocence and preserve a sense of purity in a world he views as corrupt and phony. It reflects his inner conflict between his own lost innocence and his longing to prevent others from experiencing the same disillusionment.