This space curve in a cube without projections (1a) math model is a classic. To view the projections of the space curve (in the center) on a plane, just take a torch (or your cell phone lamp).

Its projections to the sides of the cube are particularily interesting, one is a standard parabola, another one some graph of a polynomial of degree three, and the third one is a curve with a so-called cusp.

In mathematics, the particular curve used for this model, is called rational normal curve, with parametrization $(t,t^2,t^3)$.

The construction of such mathematical models of curves with projection goes back at least to the year 1879 when Christian Wiener created eight models illustrating mathematical space curves. These had an interesting shape at the origin which projects interestingly onto three coordinate planes.

To purchase our 3d-printed modern version of this model use the “buy now” link provided below. You will be sent to our online shop at shapeways where you will be able to choose a size and color. Your object will then be 3d-printed just for you and sent to you in really short time where ever you are in the world.

We also created a model which is identical apart from the fact that the three mentioned projections are also shown in the model. This and some other posts related to algebraic space curves models are shown below:

#### Space curve in a cube with projections (1b)

This space curve in a cube with projections (1b) is a math classic. Use a torch to compare the projections of the space curve (in the center) on a plane with the 3d-printed ones.

#### Space curve in a cube without projections (1a)

This space curve in a cube is a math classic. To view its projections on a plane, just take a torch (or your cell phone lamp).

#### A trefoil knot pendant

A trefoil knot is the simplest non-trivial mathematical knot. It has been known for thousands of years.

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