Henry Kuttner's "The Uncanny Power of Edwin Cobalt" (as by Noel Gardner) (short story, weird, free)

"It seemed if I doubted the existence of anything, that thing ceased to exist. And the power was retroactive. The thing never had existed."

That is the basic conceit of the story: when narrator begins to doubt the existence of something, that thing not only ceases to exist, but had never existed in the first place! This is the story of him realizing his power, & eventually beginning to doubt if he himself existed...

Fact sheet.

First published: Fantastic Adventures, October 1940.
Read online at UNZ.
Rating: B.
Related: Stories of Henry Kuttner.