The rectangular ‘Head’ of the Kinect was 11″ x 2.5″ x 1.5″ (width x depth x height), while the iPhone X Notch is approximately 1.4" x 0.25" (w x h) .
iPhone X — Top ‘Notch’
Evi Meyer

That’s almost 50x smaller just in terms of front-facing surface area (16.5 in² vs. 0.35 in²). Taking volume into account it’s surely at least 100x smaller.

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