Spiral

Spiral

Spiral

Brakke's Pseudo-Batwing Surface

Brakke

Triply Periodic Minimal Surfaces; A minimal surface is a surface that is locally area-minimizing, that is, a small piece has the smallest possible area for a surface spanning the boundary of that piece. Soap films are minimal surfaces. Minimal surfaces necessarily have zero mean curvature, i.e. the sum of the principal curvatures at each point is zero. Particularly fascinating are minimal surfaces that have a crystalline structure, in the sense of repeating themselves in three dimensions, in other words being triply periodic.

24 Cell

bathsheba Sculpture

In geometry, the 24-cell (or icositetrachoron) is the convex regular 4-polytope, or polychoron, with Schläfli symbol {3,4,3}. It is also called an octaplex (short for "octahedral complex") and polyoctahedron, being constructed of octahedral cells. The boundary of the 24-cell is composed of 24 octahedral cells with six meeting at each vertex, and three at each edge. Together they have 96 triangular faces, 96 edges, and 24 vertices. The vertex figure is a cube. The 24-cell is self-dual. In fact, the 24-cell is the unique self-dual regular Euclidean polytope which is neither a polygon nor a simplex. Due to this singular property, it does not have a good analog in 3 dimensions.

medical device

Cookgas

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Matt Lombard

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4D cube with square rods instead of round

Unknown

Modified Version of what I've seen on 3D content Central

Andrew Berry

Hole saw

marvu

limber for the 6 pounder fieldgun

marvu

field gun from the civil war

unknown

Klein Bottle