I was looking for the right fractal under a different name: "Rytman" doesn´t exist, but RTTYman does, thanks again to Bob Margolis. As it is almost 8 years old (and difficult to find), I take the liberty of reproducing it. It´s pure Moire. JUST TRY IT - again ! rttyman1.gif { ; Bob Margolis <rttyman@wwa.com> ; spiral #1 ; Fri. 28 Nov. 1997 reset=1960 type=formula formulaname=contest4 passes=1 center-mag=-0.59936347650278510/-0.04191765499206602/5701.719/1/79.999 params=0.75/0.15 float=y maxiter=600 inside=bof60 outside=real logmap=58 invert=0.5/0/0 distest=2/1/640/480 colors=000<3>00111100222200333300444400555500555500666600777700888800999 \ 900AAAA00AAAA00BBBB00CCCC00DDDD00EEEE00FFFF00FFFF00GGGG00HHHH00IIII00JJJ \ J00KKKK00LLLL00LLLL00MMMM00NNNN00OOOO00PPPP00QQQQ00QQQQ00RRRR00SSSS00TTT \ T00UUUU00VVVV00VVVV00WWWW00XXXX00YYYY00ZZZZ00____00____00````00aaaa00bbb \ b00cccc00dddd00eeee00eeee00ffff00gggg00hhhh00iiii00jjjj00jjjj00kkkk00lll \ l00mmmm00nnnn00oooo00oooo00pppp00qqqq00rrrr00ssss00tttt00tttt00uuuu00vvv \ v00wwww00xxxx00yyyy00zzzz00fzzz00zyyy00yxxx00xwww00wvvv00vttt00tsss00srr \ r00rqqq00qppp00onnn00nmmm00mlll00lkkk00jjjj00ihhh00hggg00gfff00eeee00dcc \ c00cbbb00baaa00a```00____00ZYYY00YXXX00XWWW00VVVV00UUUU00TSSS00SRRR00QQQ \ Q00PPPP00OOOO00NMMM00LLLL00KKKK00JJJJ00IHHH00HGGG00FFFF00EEEE00DDDD00CBB \ B00AAAA009999008888007777005555004444003333002222 cyclerange=1/1 } contest4 {; Kerry Mitchell ; slightly optimized version of Contest formula z=p1, c=pixel: z2=sqr(z), z=z*z2+c*(1+z-z2), |z| <= 4 } Thank you Marcus Rezende