Samuel Norton - Mercurius Redivivus, 1667.

The diagram shows the Tree of Life with a venomous toad among the roots, while on the top of the tree, among the roses, there is a crown, a symbol of unity. Alongside the circles and triangles, we find triples significant for both alchemy and spiritual transmutation: White - Black - Red, Jupiter - Mars - Venus, Water - Earth - Fire, Spirit - Soul - Body, Heaven - Sun - Male, Earth - Moon - Female. In the square there are Mercury and Anthropos - both of them seeking purification.
It is said that gometrical bodies placed in each other represent a development from Chaos to Perfection (Square - Traingle - Circle).


Dark Water
In the mysterious world of the Nethersphere, plans have been drawn up.Missy is about to come face to face with the Doctor, and an impossible choice is looming.“Death is not an end” promises the sinister organisation known only as 3W – but, as the Doctor and Clara discover, you might wish it was.