In either reading, it did not occur to me to consider an implication that Einstein was referring to consciousness as a delusion. I assumed in both cases that he was saying that our experience of separateness is the delusion.
Einstein obviously did not, but the changed version of what he wrote has that implication without including “our consciousness” in the 2nd sentence.
BTW, I can’t figure out why he used the term “optical” delusion, rather than just “delusion”, unless he was just trying to say it in a way that would not tend to turn people off. (It might be difficult for people to accept that we are deluded, but less difficult to accept that we are subject to optical illusions. Anyone who has seen optical illusions, knows from subjective evidence that we are subject to sometimes see things not as they actually are. Delusions OTOH involve believing something rather than seeing something.) Or perhaps he was saying, in a short hand way, that the delusion of separateness that we have is analogous to an optical illusion, but is a natural product of our consciousness, just as optical illusions are a product of our visual perceptual and visual processing abilities.
How about double vision? Is it an optical illusion or delusion?
Diplopia, commonly known as double vision, is the simultaneous perception of two images of a single object that may be displaced horizontally, vertically, or diagonally (i.e. both vertically and horizontally) in relation to each other.
Temporary double vision:
Temporary diplopia can be caused by alcohol intoxication or head injuries, such as concussion.
When I was really drunk, I definitely saw two moons even with one eye closed.
Some people are able to consciously uncouple their eyes, either by over focusing closely (i.e. going cross eyed) or unfocusing. Also, while looking at one object behind another object, the foremost object’s image is doubled (for example, placing one’s finger in between one’s face while reading text on a computer monitor). In this sense double vision is neither dangerous nor harmful, and may even be enjoyable. It makes viewing stereograms possible.
Bold added by me.
It could be spiritual delusion which is like a kind of optical delusion.
On the most fundamental level, it is a misunderstanding of the nature of reality; more specifically–a misunderstanding or mis-perception of the nature of self and of phenomena.
Or audio delusion/illusion?
Stereophonic sound reproduction of spatiality can be considered as an audio delusion/illusion. All loudspeakers are tested in the anechoic chamber in mono. So, mono is true and stereo is false as mono is equivalent to listening through a doorway to the audio performance.
OTOH, biaural recording is the closest to what we hear in reality.
Binaural recording is a method of recording sound that uses two microphones, arranged with the intent to create a 3-D stereo sound sensation for the listener of actually being in the room with the performers or instruments. This effect is often created using a technique known as “Dummy head recording”, wherein a mannequin head is outfitted with a microphone in each ear. Binaural recording is intended for replay using headphones and will not translate properly over stereo speakers.
Bold added by me.