The mouse won't work on surfaces that pass through or reflect light, such as glass tabletops or mirrors.
CNN: Review: Apple Pro Mouse
The finger gesture that people use to dismiss the notifications can be distracting, as can the flash of light on the Glass itself.
CNN: Figuring out real-world etiquette for Google Glass
They built a storefront window with handprints that looked as if they were created by light or frosted glass.
FORBES: Holographs At Hermes And Other Innovative Ideas Students Pitched To Luxury Brands At LEF Program
Prof Simon White likens it to the way light is bent as it passes through the lumpiness of an old glass window pane.
BBC: Planck telescope: A map of all the 'stuff' in the cosmos
Physicists have known for a long time that the speed of light is reduced when it travels though any transparent medium, such as water or glass.
BBC: A Bose-Einstein condensate: It slows down light
Inside the BEC, the so-called refractive index (which measures the slowing of light) becomes enormous: as high as 100 trillion times greater than that of glass.
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