And at that time: (Deut. 22:6)... do not take the mother upon the children. Eggs are from the aspect of the angels called ophanim, chicks are from the aspect of the ‘youth’ – Metatron, children are from the aspect of the throne, which is the ‘the tabernacle of peace’, which is the nest of the Shekhinah, for Higher Mother nests in the throne, in the three upper sephirot.
The Middle Pillar comprises six sephirot, nesting in Metatron. Lower Mother nests in the ‘wheel’ (ophan), of which it is stated: (Ez. 1:15)... and behold one ophan (wheel) on the earth...