What to call these structures? I call 'em scales, Jim Muth calls 'em terraces. It is my suggestion that someone go to the expense and bother of convening an international conference on standardizing fractal graphic nomenclature. I'd volunteer but I'm quite busy at the moment. Until then I'll have to make it up as I go along. As I am a creature of habit I have posted the completed fractal at http://maxitersfractalfollies.blogspot.com fract257.gif { ; remix ; blank ; calctime 0:12:34.07 ; created Jun 14, 2010 ; Fractint Version 2004 Patchlevel 9 reset=2004 type=formula formulafile=fotdv1.frm formulaname=contest4a center-mag=-1.45759282649133000/+0.00712563729151517/5934.286/1/90/3.885\ 78058618804789e-016 params=-1.194830164494766/-0.1142918179876095/4000/0 float=y maxiter=4000 inside=0 outside=tdis colors=00048F49F59G5AH5AI5BJ6BK6CK6CL6DM7DN7EO7EP7FP8FQ8GR8GS9HT9HU9IUAI\ VAJWAJXBKXBKYBLYCLZCMZCM_DN`DN`DOaDOaEPbEPbEQcFQcFRdFReGReGSfGSfHTgHTgHU\ hIUiIViIVjIWjJWkJXkJXlKYlKYmLZnLZnM_oM_oM`oN`pNapOaqObqPbrPcrPcrQdsQdsRe\ tRetRftSftSgtTguThuUhuUivVivVjvVjvWkwXkwYlwYlwZmxZmx_nx_nx`ox`oxapyapybq\ ybqycrydryesyeszftzgtzhuzhuzivzjvzkwzmwznxzpxzqyzryzuzzuzzryzqyzoxznxzmw\ zkwzjvzivziuzhuzgtzftzfszesydrycrybqybqyapyapy`ox_ox_nxZnxZmxYmwYlwXlwXk\ wWkwVjvVjvVivVivUhvUhuTguTguSfuSftRetQesQdsQdrPcrPcrObqObqOapNapN`oN`oM_\ nM_nMZmLZmLYlLYlKYlKXkJXkJWjJWjIViIViIUhHUhHTgHTgGSfGSfFRfFReFQdFQcEPcEP\ bEObDOaDNaDN`CM_CM_BLZBLZBKYAKYAJXAJWAIV9IU9HU9HT8GS8GR8FR8FQ7EP7EO7DN7D\ M6CL6CL6BK6BJ5AI5AH59G59G48F48E47D37C36B36A35A25924824723613512412411301\ 200100000101211312412413523624724825935936A36B37C47D48E } frm:contest4a {; Kerry Mitchell (variable bailout by JM) ; formulaname appended to "a" to differentiate from ; previously posted contest4 formula ; slightly optimized version of Contest formula z=p1, c=pixel: z2=sqr(z), z=z*z2+c*(1+z-z2), |z| <= p2 } Roger Alexander _________________________________________________________________ Game on: Challenge friends to great games on Messenger http://go.microsoft.com/?linkid=9734387