Is it 2D? Rui: No, it's 3D as it's not flat ... When you look for shapes in nature, they may not be smooth and you may need to look carefully and use your imagination Sometimes you can find ...

Once the researchers identified the new shapes, they began to see them all over the place—in nature ... example of 2D soft cells. Regős wrote back: no, they were 3D soft cells.

A 2D shape could have line symmetry or rotation symmetry, or both! 3D shapes are described by their faces, edges and vertices. The faces can be the same shape or different, and a 3D shape could ...

The technique, which cleverly demonstrates the link between 2D and 3D geometry, could be used by engineers to create self-assembling prototypes (Science 315 1116). It’s quite easy to see how simple 3D ...