Joe Bartholomew

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About the Extrinsic Vertices Project
Extrinsic Vertices are lattices and patterns developed from tilings of polygons. I create edge-to-edge tilings or tile patches, and then plot the extrinsic vertices of potential tiles, creating a lattice structure. From these lattices I germinate patterns. The pattern lines extend out from the vertices of tiles and potential tiles. The images shown are in sets of four. Each set includes a tiling, an extrinsic vertices diagram, a pattern, and an enlarged detail of the pattern. The web versions of tilings and vertices are representative of their digital prints. The patterns are intended to provide a glimpse of their print versions, but cannot accurately duplicate the same detail.

I developed the Animated Extrinsic Vertices from the same underlying structures. Like the static images, the animated versions were built with Flash. I have converted some of the animations to movies suitable for viewing with iPhones. Recent examples are linked from the Home page.

Extrinsic Vertices

The processes, lattices, and patterns in this project are not math. I'm influenced by structures in math, science, architecture, and design, but unconstrained by the rigorousness of math. The patterns have no practical use or purpose beyond this project.

Extrinsic vertices and potential tiles are terms that describe objects unique to this project. They are elements I designed to create lattices and patterns, but are not recognized elsewhere. I begin with tile sets of two or more regular polygons, rectangles, isosceles triangles, isosceles trapezoids, or rhombuses. The selection and arrangement of tiles is not necessarily predetermined as in a periodic or symmetrical pattern. At any step in building a tiling I can make multiple selections from the tile set, each with potential vertices. The vertices of potential tiles are extrinsic to the tiling. These vertices lie in characteristic dot patterns or lattices depending on the angular properties of the tile set.

I often borrow from math a preference for edge-to-edge tilings, simple polygons, and filling the plane with no gaps or overlaps. In contrast to typically symmetrical tilings like those in Islamic architecture, I may opt to create nonperiodic tilings, to select asymmetry. Ultimately I obscure the tilings with overlapping patterns.

These designs begin with tile patches, not in fact tilings or tessellations. They are tile patches – a finite number of tiles from some tiling. Some of them could be extended to fill the plane. It's not necessarily clear how they would be extended, or what a tiling extending any patch might look like.

My tilings based on a pentagon tend to include polygons with angles that are multiples of 18 degrees. Those based on a hexagon tend to include polygons with angles that are multiples of 30 degrees. Tilings based on a square tend to include polygons with angles that are multiples of 45 degrees. Tile sets with just one of these three angle groups have vertices and extrinsic vertices that lie in characteristic patterns depending on the angles used. Other mixed tile sets have their own characteristic vertex lattices. As tilings become complex with mixed tile sets the lattices reveal new patterns characteristic of the tile set, often repeating rosettes.

For reference, I refer you to the dot patterns described in Tilings and Patterns, by Grunbaum and Shephard (p. 238-246). Some of my simplest lattices correspond to Bravais lattices in 2 dimensions. The more complex lattices are possibly overlain combinations of dot patterns or lattices. I emphasize that the images and techniques in this project are not math.

General Statement: The universe is genuinely unitized and mathematical. Natural beauty is inextricably conspicuous in minute units, massive aggregates, and math that explains or stands alone. Programming can imitate the orderly aggregation in natural systems. There's a bit of geometry, always discrete units and assemblage in designing with code. I draw by programming because it facilitates connecting, organizing, elaborating, extending systems, and creating aggregates homologous to natural beauty. I advocate using complex technology to create art that mimics natural beauty. If you know the technology and use it assertively, resolutely, and creatively you can produce something new and interesting. If it's a bit innovative it might also be instructive, at least for a few other artists. Maybe it opens a path with potential. You can work with the natural beauty of math; though no one is likely see it in your work. You can also invent your own biomorphic forms.

 

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  Copyright 2007 Joe Bartholomew