JF Ptak Science Books Post 1913
I cannot think of another illustration by a scientist or philosopher who attempts to explain their own, literal, view of the world and then offer what this looks like to the reader from inside his own head, looking out through his own eye. That's exactly what Ernst Mach is doing right here on page 15 of his influential book Die Analyse der Empfindungen, the fourth German edition ("The Analysis of Sensations and the Relation of the Physical to the Pyschical", published in Jena in 1903).
There is nothing in this world for Mach that is not admissible to the human brain that is not empirically verifiable--that is, the world is nothing but awash in sensation and that sensation itself forms part of the experience of, well, experience. I've actually never been interested in the philosophy of science, and this is one of the reasons why. Nevertheless I boldly break through my own prejudices to enjoy this phenomenally original image, drawn from the inside of Mach's working mind, looking out through his eye socket, over his mustache, under his eyebrow, around his nose, out across his body and then leaping into the rest of the world. I think he does make his point about the essential nature of the observer. And much like the classic Steinberg New Yorker cartoon of the world view of the New Yorker (of course this includes only Manhattan), I know some number of people who have transposed their bodies much like Herr Mach into the Steinberg map--except that their worldview ends basically at the Hudson River (Mach's feet) with the rest of the world being the sliver out there beyond the river (Mach's window) until you go 359 degrees around the world to get back to the East River (and back inside Mach's noggin). It is an unusual world view to have, but someone has to have it so that we can at least identify it so.
I just like the picture.
(Section 10, describing this image, with translation by C M Williams and Sydney Waterlow from the blessed Dover people in 1959):
"The considerations just advanced, expressed as they have been in an abstract form, will gain in strength and vividness if we consider the concrete facts from which they flow. Thus, I lie upon my sofa. If I close my right eye, the picture represented in the accompanying cut is presented to my left eye In a frame formed by the ridge of my eyebrow, by my nose, and by my moustache, appears a part of my body, so far as visible, with its environment. My body differs from other human bodies - beyond the fact that every intense motor idea is immediately expressed by a movement of it, and that, if it is touched, more striking changes are determined than if other bodies are touched - by the circumstance, that it is only seen piecemeal, and, especially, is seen without a head. If I observe an element A within my field of vision, and investigate its connexion with another element B within the same field, I step out of the domain of physics into that of physiology or psychology, provided B, to use the apposite expression of a friend of mine made upon seeing this drawing, passes through my skin. Reflexions like that for the field of vision may be made with regard to the province of touch and the perceptual domains of the other senses."