The shape of our planet is one of the unknowns that has always existed on Earth. It has aconcreteshape and is something that has been the subject of discussion for many years. In f ...

They discern one another's shape both by touching and by seeing how the lines appear to change in length as the inhabitants move around one another. One day, a sphere appears before the square.

[DaveMakesStuff] demonstrates a great technique for 3D printing a sphere; a troublesome shape for filament-based printers to handle. As a bonus, it uses a minimum of filament. His ideas can be ...