There is another possibility and that is remote viewing, for there have always been people (let's call them "seers") who have had this ability. Edgar Cayce is one who springs to mind here and he was known as the oracle of Idaho, since the C's told us that he had a genetically enhanced ability to tap into the information field or the Akashic Record. Moreover, the Great Pyramid because of its hyperdimensional design attributes may have assisted seers or remote viewers to see into the past as well as the future. The C's even supported this notion in the following extract from the transcripts:
Session 22 August 1998:
Q: Okay, then we will forget Zep Tepi. Also, it says here regarding the issue about iron: ‘It is unsettling to discover in the Pyramid Texts, supposedly the work of Neolithic farmers who had hardly begun to master copper, that there were abundant references to iron. The name of it was B’ja, or the ‘Divine Metal.’
We always encounter it in distinctive context to astronomy. For example, B’ja is frequently mentioned in the text in connection to the ‘Four Sons of Horus,’ presumably related in some way to strange beings known as the Shemsu Hor, or the ‘Followers of Horus,’ or the ‘Transfigured Ones.’ At any rate, these very mysterious ‘Sons of Horus’ seem to have been made of iron or to have had iron fingers. [...] It is clear that iron was somehow seen by the composers of the Pyramid Texts as being imperative in the rituals aimed at ensuring new life cosmic and stellar. The verses of the Texts connect the metal and its uses to the ancient prototype of all such rituals by means of which Osiris himself, Egypt’s ‘Once and Future King,’ died and was restored to immortal life as Lord of the Sky Region of Orion. ‘The doors of iron which are in the starry sky are thrown open for me and I go through them.’ It appears to be nothing less than an iron stargate intended to admit Osiris and all the dynasty of dead kings after him into the celestial realms of the belt of Orion. But, if the Pyramid Texts are describing a stargate, they are also describing a timegate for they express no doubt that by passing through the iron portals of the sky, the soul of the deceased will attain a life of millions of years.’ So, they are describing the Pyramid as a stargate, a timegate, a portal. However, they are doing so in figurative terms, that the person could mentally travel, or use this in some way. Could you comment on this bit about the iron stargate?
A: Iron is highly magnetic.
Q: Yes, we know that...
A: Opens doorways or portals.
Q: Were the Egyptians using the Pyramids to travel in time?
A: Maybe in a crude sense, more like an oracle.
So it is possible that gifted seers (remote viewers) in ancient Egypt may have seen images of the past, or possibly of the future too, depicting advanced weaponry and some of these were subsequently recorded in stone. I have seen the kind of crude imagery that remote viewers draw when they are in the zone, which could therefore account for the crude depictions of the weapon systems carved at Abydos.
As to the status of these "seers", they often held prominent positions at the Egyptian court. As to their ability to see beyond the normal realm (i.e., pierce the veil), the C's said this in the session dated 13 July 2002:
Q: (L) What about the so-called seventh, or "third eye" chakra?
A: Seer. The union of the heart and intellectual higher centres.
Q: (V) What about the many ideas about 12 chakras, and so forth that are currently being taught by many new age sources? {Barbara Marciniak for one.}
A: There are no such. This is a corrupted conceptualization based on the false belief that the activation of the physical endocrine system is the same as the creation and fusion of the magnetic centre. The higher centres are only "seated" by being "magnetized." And this more or less "External" condition [location of the higher centres] has been perceived by some individuals and later joined to the perceived "seating" locations, in potential. This has led to "cross conceptualization" based on assumption!
Hence, the need to build up one's magnetic centre.
The English occultist Kenneth Grant (1924–2011) also touched on the ability of some artists, as gifted seers, to tap into this unseen realm, which he called the “the Mauve Zone.”
Perhaps more than any other modern occult writer, Grant stressed the importance, potential and power of such creativity, writing in Aleister Crowley & The Hidden God that, “Great art is always simple… true art expresses Eternity.” From the beginning, Art by the likes of Austin Osman Spare and Grant’s wife, Steffi, is essential to the function of the Typhonian Trilogies – the text illustrates the pictures as much as the pictures illustrate the text. Later, in Outside the Circles of Time, Grant writes regarding artists such as Salvador Dali, Sidney Sime, Spare, and Tanguy:
These artists accomplished a leap into other dimensions and – this is the important point – returned to record their extra-dimensional experiences… Art, in the true and vital sense, is an instrument, a magical machine, a means of occult exploration which can project the seer into the realm of the Unseen and launch the waking mind into the seas of the subconsciousness.
Grant also linked such artistic magic to the realm of literature too and in doing so made a connection to ancient Egyptian magic or "Heka":
Words can weave worlds, words can conjure ghosts – words can transport and transform and alter consciousness – the only limit being imagination. It is to be remembered that imagination is concerned with creating images, in which respect it is directly related to the Ancient Egyptian Heka: a word that meant both ‘Magic’ and “the making of images.”