What a Spatial Computer Must Be: A Categorical Test Applied to Apple Vision Pro's Market Trajectory

This paper proposes a single test for genuine spatial computing, whether taking a device off ends a stay in a place or simply closes something a person was looking at, and applies that test to Apple Vision Pro's publicly reported sales figures from 2024 and 2025. Specification checklists, six degrees of freedom tracking, room mapping, occlusion, and world-anchoring, cannot separate genuine spatial computing from an expensive disappointment, the paper argues, since a well-funded device can pass every item on that checklist and still leave a wearer nowhere to be. A categorical test works differently: whether removing the device ends a stay in a place or simply closes something a person was looking at. The paper applies this test to Apple's Vision Pro, launched in the United States in February 2024 at $3,499, drawing on shipment and financial reporting rather than invented figures. Vision Pro sold roughly 390,000 units in its 2024 launch year, then dropped to under 100,000 units across all of 2025, with quarterly volume down to about 45,000 units by the final quarter of 2025. Apple cut its digital advertising spend on the device by more than 95 percent during 2025 and, according to reports covered in the paper, paused a second-generation model to focus on a lower-cost headset instead, despite an October 2025 hardware update. The pattern, a sharp early spike followed by a fade with no broad second wave, fits a categorical test better than a specification checklist, since Vision Pro's tracking and occlusion are widely regarded as among the best available. This is the third paper in the five-part series.