The four album series collected in English. Beautifully illustrated in a style reminiscent of Mazzuchelli's Batman Year One. Don't expect a biography of the cartoonist, this is a fantasy.

From the publisher:

Get ready for a dizzying dive into the "McCay Dimension" with this true and false tribute to the undisputed master of the imagination.

McCay is an invented biography chronicling authentic -- though only partially true -- stories of the life of the future creator of Little Nemo, Winsor McCay -- in which McCay's life is enriched by an imaginary encounter with British mathematician and science fiction writer Charles Hinton.

Hinton, as a mathematician and philosopher, postulates the existence of a fourth spatial dimension -- and seeks an artist capable of representing it, one with an innate sense of perspective and a limitless imagination. In Winsor McCay, Hinton finds such a man, and when their imaginations combine, an entirely new world opens up to them both...