SUBDIVISION OF SPACE AMI KORREN
Name: Ami Korren, Architect, (b. Tiberias, Israel, 1950). Address: Faculty of Architecture and Town Planning, Technion, Israel Institute of Technology, Technion City, Haifa 32000, Israel. Email: Korrena@inter.net.il Fields of interest: Architecture; Morphology, geometry, architectural crystallography; and Minimal and consequential forms. Publication and exhibition: Korren, A. (1993) Periodic 2Manifold Surfaces which Divide the Space into Two Identical Subspaces, [in Hebrew and English], Master Thesis, Haifa: Technion, 120 pp. Burt, M. and Korren, A. (1995) Selfdual space lattices and periodic hyperbolic surfaces, In: Symmetry: Natural and Artificial, Budapest: Symmetrion, 100103. Burt, M. and Korren, A. (1996) Periodic hyperbolic surfaces and subdivision of 3space, In: Katachi U Symmetry, Tokyo: SpringerVerlag, 179183. Korren, A. (1999) [Exhibition],
In: Science in the Arts –Art in the Sciences, Budapest: Ernst Museum.
Abstract:
The morphological dealing with space subdivision by continuous 2manifold
surfaces is one of the important issues for understanding organized space
and its order. The phenomenon of periodic surfaces that divide the space
into two identical subspaces was dealt with over the years by various researchers
from different scientific fields. These periodic 2manifold surfaces are
continuous and divide the space into two identical subspaces, which are
graphically characterized by two dual tunneled space networks. These surfaces
have the shape of a sponge structure. All the known surfaces were discovered
in an empiric way by various scientific researchers. All in all there were
seven topologically different surfaces. The goal of the research of the
above mentioned phenomenon was to identify the 2manifold, classify and
exhaust them. A systematic method was suggested. The method was strongly
based on the theory of symmetry groups. It was assumed that the number
of surfaces, topologically different, is finite because of the fact that
the number of symmetry groups is finite. With the method for the exhaustive
search the seven known topologically different surfaces were discovered.
But now it was done in a systematic way. Topologically different – means
that the two dual tunnel networks have different shapes, which are the
identification mark of the surface. This identification of the 2manifolds
point out that there is a direct correspondence between the continuous
partition surface, the character of the two complimentary subspaces and
the two selfdual lattices representing them. This phenomenon of the two
identical subspaces, the surface in between, and the two selfdual lattices
representing them makes the exhaustive search of any of them as one and
the same problem. While studying this phenomenon the idea to search for
the selfdual lattice pairs first arose for reasons that will be mentioned
later. This approach led the author to discover a new unknown selfdual
space network and a new 2manifold surface in between.
This paper intends to report on
research in which generation of dual space lattices and hyperbolic partition
surfaces are at the core of the inquiry. This research is still in its
initial stages. This stage, the impression is that the number of the dual
and identical lattice pairs and the associated periodic hyperbolic surfaces,
partitions that subdivide the entire space into two complementary and identical
subspaces, is infinite.
1 The phenomena of 2manifolds
surfaces
The researching of the phenomena of periodic 2manifolds which are in between two identical  dual subspaces led us to finding the main characteristics of these surfaces. We have chosen to discuss 2manifold
with 2fold (180^{0}) rotation symmetry axes. These axes generate
a space lattice, which should be called "the 2fold axes lattice". This
lattice is periodic, and as such has all the periodicity generating properties,
meaning an 3dimensional repetitive cell unit and elementary periodic region
(E.P.R.).
2 The E.P.R. (Elementary Periodic Region) approach The E.P.R. is the smallest space unit (fundamental region) derived from the Euclidean space by means of the symmetry group that acts on this space. The E.P.R. contain complete
representation
of all the phenomena taking place within the "periodic complex" and particularly,
representation of the whole periodic space, its symmetry group, the 2fold
axes network, the two complementary (identical) subspaces, the self dual
latticespair characterizing them, as well as the partion surface in between.
3 The exhaustive method The method of exhaustive search develops in steps as follows:
1. Exhaustive search and examination of all the possible E.P.R.s. 2. Exhaustive search of all possible E.P.R.s capable of containing fundamental region of 2manifold. Fundamental region of such 2manifold divides the E.P.R. into two identical volumes and it includes representation of 2fold axes which transform one subspace into the complementary dual other . 3. Repetitively duplicating the E.P.R. (containing 2fold axe(s)) until the resulting 2fold axes lattice is revealed. 4. Identifying, within the 2fold axes lattice, the possible closed boundary perimeter(s), which could give rise to minimal surface unit (simulating the dipping operation of a wire in sop solution). 5. Duplication of the closed boundary perimeter with the minimal surface unit (through application of the 2fold axes) to an extent when its general structure, its "tunnel system" and characteristic dual networks could be identified.
The aforementioned method of searching for the 2manifolds, lead to the discovery of many 2manifolds, with some being topologically similar, and it also lead to exhausting all the 2manifolds that are topologically different. There are two physical characteristics to the 2manifolds. One is the form of the translation cell of the 2manifold. The other one is the geometric form of the two complementary dual subspaces, which are represented by the two dual networks. There is a direct, one to one correspondence between the typical translation cell and the tunnel networks. 2manifolds that are characterized by similar tunnel networks are topologically similar. Classifying the 2manifolds according to the tunnel networks or the typical translation cell leads to discovering the 2manifolds that are topologically different from one another. Using the aforementioned searching and classifying method lead to finding seven topologically different 2manifolds. The fact that the tunnel networks
characterize the 2manifolds on a direct, one to one correspondence leads
to the conclusion that finding two selfdual networks means finding the
surface partition in between. Using empiric search for dual networks we
have found a new unknown pair of selfdual networks, which are topologically
different from the other seven that were found by the aforementioned search
method.
5 A new search method Finding the new selfdual network opened the door to revealing a completely new array of surfacepartitions and the associated selfdual space networks, which characterize each of the two interwoven, complementary subspaces. In view of the last development, there is an advantage in shifting the gravity center of the research and pursuing the selfdual lattices pairs first. The new search method is built of several steps, and is partially based on the exhaustive method: 1. Extracting the selfdual lattices directly from the relevant E.P.R.s (containing 2fold rotation axes) the search of which was exhausted previously. 2. It was done by locating the interconnected configuration of vertices and edges and its rotated image (about the 2fold axes) within the E.P.R 3. Find the 2manifold unit, which subdivides between the complementary dual lattices, in a manner that assures continuity and smoothness over the boundaries of the E.P.R. and for the whole periodic hyperbolic surface. It requires that its incidence with the bounding reflection planes will be at right angles all along the incidence curve.
6 Conclusions In the face of the apparent significance of the subject of dual lattice pairs and the subsequently related continuous Periodic Hyperbolic Surfacepartitions, within the general theme of Space Subdivisions, these complementary spatial configurations never occupied a central position in a systematic and exhaustive research inquiry. It should be noted that these configurations are the abstract idealized prototypes of all sponge structures, all labyrinthlike branching, infinite, enveloped, spaces and other natural phenomena, such as periodic filament configurations and continuous warped fields. They are an idealized geometric
abstraction of continuous labyrinths, which shape the interiors of our
modern megastructures and our evolving urban down town environments.
