Motion: Motion is a trigger for action, and without motion there can be no interaction. Information must move form one entity to another.
Space: Space provides a context for motion. All interactions take place in space. Space can be a digital screen or the physical space we inhabit.
Time: All interactions take place over time. Movement through space takes time to accomplish. Time can be measured in different increments and is different digitally than in the human space.
Appearance: Is how something looks, such as proportion, structure, size, shape, weight, and color. How something looks can tell use how to interact with it.
Texture: Texture is how an object feels in the hand. The texture can also tell you how to interact with an object.
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