Quotes:
The user can rotate around the hypercube, or perform direct-manipulation rotations in 4D.\n\nFor a 4D rotation, the 3D vector described by the dragging of the mouse in the plane of the screen combined with the 4D unit vector (0 0 0 1) specify two basis vectors of a four-dimensional plane of rotation.\n\nThis is a lot more intuitive than a set of sliders.\n\nBefore I show an example of the 4D rotation, wrap your head around this simple 3D rotation of a regular old cube.\n\n
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