“What has knowledge of the world become in the course of the last centuries? In its relation to the Universe, it has become a mere mathematical-mechanical calculation, to which in recent times have been added the results of spectra analysis; these again are purely physical, and even in the physical domain, mechanical-mathematical. Astronomy observes the courses of the stars and calculates; but it notices only those forces which show the Universe, in so far as the Earth is enclosed in it, as a great machine, a great mechanism. It is true to say that this mechanical-mathematical method of observation has come to be regarded simply and solely as the only one that can actually lead to knowledge.
Now with what does the mentality which finds expression in this mathematical-mechanical construction of the Universe reckon? It reckons with something that is founded to some extent in the nature of Man, but only in a very small part of him. It reckons first with the abstract three dimensions of space. Astronomy reckons with the abstract three dimensions of space; it distinguishes one dimension, a second (drawing on blackboard) and a third, at right angles. It fixes attention on a star in movement, or on the position of a star, by looking at these three dimensions of space. Now man would be unable to speak of three dimensional space if he had not experienced it in his own being. Man experiences three-dimensional space. In the course of his life he experiences first the vertical dimension. As a child he crawls, and then he raises himself upright and experiences thereby the vertical dimension. It would not be possible for man to speak of the vertical dimension if he did not experience it. To think that he could find anything in the Universe other than he finds in himself would be an illusion. Man finds this vertical dimension only by experiencing it himself. By stretching out our hands and arms at right angles to the vertical we obtain the second dimension. In what we experience when breathing or speaking, in the inhaling and exhaling of the air, or in what we experience when we eat, when the food in the body moves from front to back, we experience the third dimension. Only because man experiences these three dimensions within him does he project them into external space. Man can find absolutely nothing in the Universe unless he finds it first in himself. The strange thing is that in this age of abstractions which began in the middle of the fifteenth century, Man has made these three dimensions homogeneous. That is, he has simply left out of his thought the concrete distinction between them. He has left out what makes the three dimensions different to him. If he were to give his real human experience, he would say: My perpendicular line, my operative line, my extensive or extending line. He would have to assume a difference in quality between the three spatial dimensions. Were he to do this, he would no longer be able to conceive of an astronomical cosmogony in the present abstract way. He would obtain a less purely intellectual cosmic picture. For this however he would have to experience in a more concrete way his own relationship to the three dimensions. Today he has no such experience. He does not experience for instance the assuming of the upright position, the being in the vertical; and so he is not aware that he is in a vertical position for the simple reason that he moves together with the Earth in a certain direction which adheres to the vertical. Neither does he know that he makes his breathing movements, his digestive and eating movements as well as other movements, in a direction through which the Earth also moves in a certain line. All this adherence to certain directions of movement implies an adaptation, a fitting into, the movements of the Universe. Today man takes no account whatever of this concrete understanding of the dimensions; hence he cannot define his position in the great cosmic process. He does not know how he stands in it, nor that he is as it were a part and member of it. Steps will have now to be taken whereby man can obtain a knowledge of Man, a self-knowledge, and so a knowledge of how he is placed in the Universe.”
https://rsarchive.org/Lectures/GA201/English/RSP1972/19200409a01.html
"Man can find absolutely nothing in the Universe unless he finds it first in himself."
Nature Science vs. Human Science. Maybe the "blind spot" is finally being seen. Steiner had it scoped out as far back as his Weimar period. This was when he 'drew the sword from the stone' in the idyllic setting of Goethe.