4D Toys. An interactive toy for 4D children.

What if you received a box filled with mysterious toys from a fourth spatial dimension?

Playfully explore and marvel at beautiful shapes powered by a groundbreaking 4D+time physics system.

Poke, throw, roll and watch as they disappear into a dimension you can't see.

Get an intuitive feel for how four-dimensional objects behave:

Become a child of the fourth dimension.

In this case the 4th dimension is not time but a 4th dimension of space that works just like the first three dimensions we are familiar with. If you count time these toys are 5D.

It turns out that the rules of how objects bounce, slide and roll around can be generalized to any number of dimensions, and this toy lets you experience what that would look like.

• Over 100 beautiful interactive scenes to play with, with more to be added in updates.
• Groundbreaking 4D+Time Physics Engine that uses new mathematics created for this project.
• Virtual Reality or Mouse & Keyboard (PC) or Multi-touch & Accelerometer (iOS) support for rich interactivity.
• Bonus: 2D/3D "Flatland" Interactive Explanation teaches by analogy about a fourth spatial dimension:
"Our inability to see all the dimensions of a 4-D world doesn't mean that we can't navigate it, that we can't reach out and feel it with our digital fingertips." —Chris Suellentrop, Wired magazine
"I'm hesitant to describe a virtual reality experience as a "killer app" ever again, but I'm oh-so-tempted once more [...] I am not sure that I've ever seen a more compelling "show-don't-tell" educational tool than 4D Toys. " —Sam Machkovech, Ars Technica

Some things to do:

• Manage to fit the hypercube into the hyperhole!
• Use the 4D shapes as fancy, perfectly symmetric, fair dice that have 5, 8, 16, 24, or even 120 and 600 sides!
• When a die is fair the probability that it lands on a particular face is the same for every face. This is done by making all the faces the same shape. However in 3D only a certain number of shapes have this property, such as:

In 4D we have additional possible shapes for dice!
• Make a stack of 4D hypercubes and smash it!
• Set up an interesting path for a few 4D dominoes!
• Unbind Rings using the fourth dimension!
• Make levers that throw hypercubes into the fourth dimension!
• Use multitouch to "squeeze" out objects into the fourth dimension!
• Play in a 4D ball pit!
• See Tesseracts (i.e. 4D hypercubes) slide down slopes!
• etc...!

We can describe our universe using three spatial dimensions (x,y,z) and time. These toys exist in a universe that has four spatial dimensions (x,y,z,w) and time. Suprisingly it is possible to generalize physical laws that descibe our universe, such as Newton's Laws of Motion, to any number of dimensions. To do this we had to come up with new mathematics. So for example, forces are four-dimensional vectors, objects rotate around planes instead of axes, etc...
While the computer does not care how many dimensions there are (it is still just working with numbers), because our universe has only three dimensions of space, we chose to represent these objects by taking a "three-dimensional" slice of them. This means that while the objects are fully 4D, only three dimensions are shown at any moment. A slider lets you move along the fourth dimension.

4D Toys doesn't take you through carefully-constructed successively harder challenges the way a "puzzle-platformer" might. It's just 4D shapes, as if you were a very young kid again and given a box of wooden toys. Play is undirected... we don't expect a child to come up with verbal realizations of what they are doing. They can learn about making stacks, and gravity, and fitting shapes into holes, and that can form the foundation for future learning. Alternatively, one can just look at how pretty it is, like the waves rolling down the ocean or the intricate swirling patterns in a fire.
Most representations of a fourth dimension are so abstract (a spinning bundle of lines) and my work has been to get away from that. It's the first time anyone has seen these objects as physical objects that bounce and roll and can be grabbed!

"Meanwhile, in the adjoining room, Emma was sliding the beads to and fro in the abacus. The motions didn't seem so strange now. Even when the beads vanished. She could almost follow that new direction�almost�"

—Lewis Padgett, Mimsy Were the Borogoves