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Osborn, John A. L., "Diminishing Opportunity in Amphography", editors: Gyorgy Darvas and Denes Nagy, Symmetry: Culture and Science, Volume 6, Number 3, pp. 418421, 1995. DIMINISHING OPPORTUNITY IN AMPHOGRAPHY John A. L. Osborn
I propose that both the geometric means and the recognizable
zoomorphs, or animal shapes, which are essential to amphography are
limited in number or in quality, and that each figurative tiling which
is devised diminishes the number and the richness of opportunities for
future amphographers. Keenly felt ethical restrictions also affect
opportunities. The ethical restrictions. The limited number and quality of recognizable zoomorphs and geometric means. An example of a different type of foreclosure may be my regularhexagon based set of eight different beetle shapes. These are examples of a type of tile which I call variably assemblable figurative tiles. Ten subsets of the eight beetle shapes will tile the plane, some in more than one way, and eight of the subsets will tile in infinite numbers of different ways. I have derived other sets of shapes out of this geometry but, aside from minor variations on the beetle shapes, the geometry has yielded only poor of farfetched zoomorphs. I believe that other good possibilities for variably assemblable figurative tiles simply do not exist in this geometry. Here are the eight beetles: (Fig. 1) But again, by devising these bat and lizard sets, I may have largely foreclosed opportunity for variably assemblable zoomorphic figurative tilings using the twofigure/ variable rhombus geometry. I have also devised, using a 60 degree/120 degree rhombus only, a variably tiling arachnoid/insectoid set of tiles, (See Fig.3 above), but with that the richest possibilities inherent in this geometry are, I think, gone. Or is this a failure of my imagination? Among regularly repeating or periodic figurative tilings, possibilities for using the most significant aspect, (or what I sometimes call the roadkill aspect), are limited in number, and are being used up. Will anyone ever be able to do a simple beetle tiling, or bat tiling, or girl tiling, or turtle tiling, or moth tiling, or bug tiling with these geometries without "infringing" my work? See Figs. 4, 5, 6, 7, 8, and 9 respectively. I don't know, but I think it will not be easy to do so. How many distinct and fully recognizable zoomorphic outlines are there for people in general or for persons of our western culture? Because we have never before thought of listing them, the number at first seems sure to be enormous. But really it is limited,perhaps quite limited. There is, however, more room for 'creativity' once we leave the glyphic realm of "most significant aspect". Surely there may be other and quite dissimilar fish possibilities in the geometry I've used. See Fig.10. But this realm of less significant aspects can rather quickly degenerate into one where the recognizability of the tile outline depends more and more heavily on clues gleaned from the internal drawing. I just recently devised the following outline, (Fig. 11), which only incidentally is composed entirely of straight lines.
It might well be said that it utterly lacks amphographic quality. Yet with the benefit of a little internal drawing it becomes recognizable as some sort of roadrunnerlike bird. ( Fig. 12) It is a variant on the geometry of the flying bird I've entitled "The Ozbird Tile," (Fig. 13), which is an equilateraltriangle based variably assemblable tile. In my work, the most extreme example of a tile unrecognizable by its outline alone would, I think, be the Daruma in my "Birth of Zen". ( Fig.14) My only excuse is the extreme difficulty of the geometry in getting it to do what I wanted: use the Penrose rhombuses to pun on the philosophy of mind. At some point close to my Daruma one enters Topffer's realm or the realm of Mr. Potato Head, something that I do not, (usually), care to do. "Figurative" no longer applies to these outlines. Hence the realm of "less significant aspects" too, is limited. I believe that geometries amenable to use in amphography, while fairly numerous, are limited in number. So we have ethical limitations, zoomorphic limitations, and geometric limitations. This would seem to make amphography a severely limited universe. Perhaps the dynamics work something like this: If M. C. Escher used up half of the good possibilities, and then I used up half of the remainder, my successor may use half of what I leave, or a mere 1/8 of what lay open to Escher's exploration back in 1936 or 1937. No, I do not think there need ever be a last figurative tiling of significant quality, but the possibilities for originality are rapidly becoming impoverished. If you want to do nice work in this field, hurry and join me. Sometimes I feel like the lone despoiler of a limited resource. In this paper I have tried to be provocative, and I sincerely hope someone can show me to be wrong. 

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