Expression based on analogy
   Ta : Earth

Before trying to understand hieroglyphs, one needs to steep oneself in Egyptian thought: analogy with specific principles played a major role, and everything was recounted in poetry. The universe was seen as a large organism (the macrocosm) and Man a small world (microcosm).
We have seen that the preparations for moulding green bricks and for reconstituting stone were similar and explained in the same way and could therefore be used as analogies. Similarly the lungs and the heart were interchangeable as they had similar functions, for although these organs do not look alike they both use and transform air. The nose also had an analogous function.
In Egypt, the chemist's kiln that transformed matter had a similar function to the sun which generated metamorphosis in nature. An analogy was drawn between stone which was cut and put to death in the quarries and then regenerated in the kiln, thus transforming it into artificial stone, and the human body, which was reincarnated in Imenty (land of the dead) when the person died. The evolution of each was told in parallel poetical terms. The separation of lime from stone was similar to a soul leaving the human body. Thus lime and the soul had identical functions. One was the critical component of reconstituted stone, the other of a new, reincarnated man.

Scenes showing green bricks being moulded and stone being reconstituted. The pile of earth is in the form of the hieroglyph representing the sound t and the earth ta. The wall is being built with rectangular bricks. The hieroglyph for stone (in or iner) is a rectangle.
In Egypt, the union of the two earths was represented by a sign called sema taouy (sema – unite; taou – earths; y – duality). The lungs signified union; the trachea represented the Nile, the vital artery and lungs that enabled Egypt to breathe.
Here a lung replaces the nose.