A Tesseract is the 4dimensional cousin of a cube, just the same way as a cube is the 3dimensional cousin of a square.

Now if you would draw 2 squares, offset them a little, and connect every corner of the squares, it looks like the wireframe of a cube.

If you do the same with 2 cubes, offset them a little, and connect the corners, you get a drawing of a tesseract.

The designer of this typeface used the same technique, ofsetting 2 3d shapes of the letters, and connecting them. Then he used the result as a basis for the typefaces.

Personally i like how this created the simple shapes in the 2nd font, theres no shading, yet somehow the shapes have a great sense of depth either way.

And in the 3rd font, i'm not entirely sure how it is constructed, but its supposedly still based on the 4d wireframe of the letters, i like how theres such a nice variety of abstract compositions, with such a strong unified style throughout the font. Also i like the challenge of figuring out how they relate back to the 4d wireframe.

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