“I can’t see in 3-D, much less 4-D,” says Segerman. For the past couple of decades, mathematicians have increasingly relied on digital imaging to see complex shapes.

These 3D sphere arrangements are intuitive. It's how tennis balls or oranges are often stacked in stores. They waste the least amount of space between balls, filling about 74% of total space.

[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 appl… ...

Alright, everyone has 30 seconds to get all the jokes out of their system before we proceed with a look at this 3D printed wooden ball polisher. Ready? Theoretically, making a sphere out of any mat… ...