Now the "sphere sponge" is POSSIBLE - very easy with my new folding mode for sphere inversion...
Mandelbulb3Dv17{
P.....S....O/...w....2.....JP873UHu0.bRFAwtaAh2Ewu.Oh3w2Gwvy0liP/DV2zyYaFnN5FMyj
................................QW5PSMg7rz1........Y./..................y.2.....
................/MU//....6Eh....22....E2.....2KWwYI1hYqD...........c./...w1....U
z.UaNadD32../.kcmd5..xBwzG51dEIXlHzjoU9p.irrzw9............2.....y1...sD...../..
.w1...sDt9y55pE9dx1..........4f1.WJmTGdjFbVCvBHt.rPyWzlFBoGOzA083PJmTGdjcUGlKZwb
IuHhC.6K7z7ZyY6D1II1hYqD......ok..............kD.2....sD..kz0...................
.............................UTRU4.Yq/O.cQ5c/.wRU4.Ks/O.kX5c/UMSU4..............
.....................wzzz1.U..6.P....M4...EB....W....61....F....8/...I1....UJl32
...U.iVFwxDE./ozPM2Tzz7lz16.mc..zXCc.El18XGQeGyDjvIRhrVAkz1............28.kFrA0.
FWb96aAIVzvh1se7Umvxz0........../6U0.wzzz1................................E.0c..
zzzz.................................2U.8.kzzzD.................................
/6U0.wzzz1...................................2CcN/UvNP6.eeWCNq0.yRii.EJJUk1f..XR
S1.mx3CcN/UvNP6.QsLsUa3.ibhV..bTV1OK.sSq40.ly3CcN/UvNP6.MwLsUa3.ibhV.kqTV1OK.sSq
40.kz3CcN/UvNP6...EsUa3.eeWCNq0.IJ36wk8.wyLsUa3.................................
E....6....E.....I....I....kLn/5OZ7LNdtaR.YaPb31...........................U.4MU/
4M........................................EnvwbNS0exz.........zD................
................................................................................
.....................2.....3....8....oINiRKNmB1.jJbPo73.........................
.....MU/4MU/4................U.E........kz1........wz.........zD................
................................................................................
................................}
Try it!!!