Hi Arend and All, Just a quick example of the depth that can be realized in UF. Here's my 1-layer (10 minutes from production through render). The base formula is Super Cubic Julia found in gnd.ufm, and I used Plain Curve Traps II coloring in the tma.ucl folder (same one that Keith used). Though it doesn't begin to compare with yours, Arend, if I took some time and really practiced, I might be able to ocme up with something more dimensional. Thanks for the fun challenge! Linda