The challenge goes beyond file formats and approaches more ontological questions. It’s relatively easy to agree on what an image is—they’re only two dimensional and don’t move (with video files just being successions of images). But in 3D, especially with interactive objects, agreement is far harder. For example, is a shoe an object, or is it a collection of objects? And if so, how many? Are the caps on a shoelace part of the shoelace, or separate from it? Does a shoe have a dozen individual eyelets, each of which can be customized or even removed, or are they a single interconnected set? If
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