Crosseye 3D - nice transpareny effects due to the gap between both volumes.
Wanted to do some isosurface meshing again - wanted to have a minimum of control over the result - a thing I really miss when playing Mandelbulb3D
A sphere clipped in two halfes by a Cayley surface (at least a surface derived from that)
All made from isosurfaces.
Rendered using Bryce.