For each of the following shape from X techniques, briefly describe the principle underlying it,

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Step 1: Motion  
- Principle: The motion technique relies on the perception of movement to ident

For each of the following shape from $X$ techniques, briefly describe the principle underlying it, explain how they can be of practical use, and give some examples. $\bullet$ Motion $\bullet$ Texture $\bullet$ Focus $\bullet$ Vergence $\bullet$ Contour