In The Beginning, the Body.

"Howard Roark laughed.
...
He felt his shoulder blades drawn tight together, the curve of is neck, and the weight of the blood in his hands." ("The Fountainhead", first page.)

Then the other descriptions: lying on the grass after a day in the quarry, the drink of cold water, floating in the sea close to Gail Wynand's yacht.

"The Fountainhead" is rooted in the embodied experience!

Then we have "In Search of the Miraculous" page 146, 2nd paragraph: "mental photographs" that include sensations, postures, tones of voice, facial expressions. All the elements of the embodied experience, self-remembering.

I'm torn between listing more examples and posting this as is. For a Gurdjieffian nothing more is needed, but an Objectivist would want more clues.