The Zohar speaks to Hashem bringing Moses into the innermost hidden rooms of Pharaoh revealing to a frightened Moses, the secrets of the great crocodile from which on deeper levels the spiritual travels. The waters surrounding the large crocodile is written as the serene river of the highest realm of Keter, the crown, in Kabbalah’s tree of life from which everything emerges. Each crocodile represents one of the 10 Sephirot spouting from a hole in each head is the color associated with that Sephirot, and though these Zohar commentaries on all this are very dense, it seems suggested that Elohim – the judgement aspect of the Holy One, like a serpent, triumphs over the negative aspects of these manifestations. Hence crocodiles? Each of the Sephirot has both positive and negative; and the crocodiles may symbolize the negative that needs to be cleansed and cleared. The Zohar speaks of the three pillars – the three vertical columns of the tree of life – on the left the white column of judgements and disciplines, on the right the red column of kindness and forbearance, and the center column in green of harmony joining the other two. The hyssop plant was used to put the purifying and protective blood on the sides and top of the doors reflecting these three pillars to protect the Jews from the last plague of death. A ’yud’ representing the most compassionate aspect of Hashem was a top each tower. And as all time is one time for the Holy One, you can see in a window on the floor what is to happen with the Egyptians burying their dead while the Hebrews are freed, and each sees the other.