A mandala site further elaborates on this:
"The mandala is a template for the mind, a state of peace and order, a resolution to the chaos within. In Jung's words, 'The severe pattern imposed by a circular [or quadra-symmetrical] image of this kind compensates the disorder and confusion of the psychic state-- namely, through the construction of a central point to which everything is related.'
(p.4, Jung, C.G. Mandala Symbolism. Translated by R.F.C. Hull. Bollingen Series/Princeton, 1959)" ('Quadra-symmetrical' is my addition, as mandalas need not possess circular elements.)

This all began with a drawing I did of an ankh holding a Ma'at feather, which was based on an ankh with Ma'at feather at the Ramesseum. I wasn't content with it, though, and I thought better to illustrate 'balance'(one of the aspects of Ma'at) with a mandala. Also, the center connecting bands suggest the 'connective justice' aspect. I'd hoped to find falcon wings for the corner element, but a 'Dover' line drawing of Nekhbet was a reasonable substitute. Usually Nekhbet grasps the 'shen' symbol for eternity, but I'd already expressed 'eternity'. (How fortunate that the hieroglyph for neheh, 'eternity of cyclical futurity', is also symmetrical, to nicely fit into the design!) So I placed Set's Was scepters, to convey the idea of 'power'.

Happily, I discovered later there is precedent for this. A piece at the National Museet, Copenhagen shows Nekhbet grasping a Was scepter:

Photo credit: "Tutincommon"
She's standing on the 'Nub' glyph which means 'golden'. I wonder if this piece came from 'Nubt', aka 'Naqada', where one of Set's ancient Temples were?