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The difference is that they look like different sizes to the user because of the different viewing distance. The really user-relevant size is subtended angle,
by bzbarsky 12y ago
The difference is that they look like different sizes to the user because of the different viewing distance.
The really user-relevant size is subtended angle, not linear size, which is why the "px" unit in CSS was defined the way it was.
- masklinn 12y agoIt's worse than that, there's the visual effect from angular size and the "manipulative" effect from interaction device. For instance, because it's used with fat and impressive fingers a smartphone held close to your face (and thus with a high angular size for its physical size) needs to provide much bigger controls (in both angular and absolute terms) than a desktop computer manipulated through a mouse. And of course this isn't linear as manipulating e.g. a Wii through its remote is also very impressive.