Scheme illustration of object identification and all-optical 3D reconstruction system. (a) A contour surface image of the object can be obtained in a single processing of the system. (b) High-contrast ...

Mathematicians are “reinventing the wheel” by giving it a new shape. Their newly imagined wheel looks like a many-dimensional guitar pick, and it could theoretically roll in ways beyond our ...

Wonky spheres can be sculpted to roll eternally downhill along any possible path, as long as the path repeats. These “trajectoids” could be used to design robots that follow particular routes, or to ...