The sight of small white figures endlessly regrouping, wandering about, pondering the light, all seen from one fixed angle, made poor spectator sport and even worse television.

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Rotational symmetry means that if you turn something through a fixed angle, it looks the same (as a starfish would if you turned it through a fifth of a circle).

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The 2.8-inch, 461k-dot capacitive touchscreen is fixed at a slight angle, making it possible to take overhead and lower-angle shots simply by rotating the entire camera.

ENGADGET

It also improved the structure so that the van can get top marks in the Insurance Institute for Highway Safety's new frontal crash test, which hits a fixed barrier at an angle.

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In addition to daily use as a "pan-focus" lens featuring a wide angle, fixed f8 aperture and shallow depth of field, it is compatible with manual focusing using a lever and capable of close-up shooting as close as 30 cm.

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The angle of the screen is also fixed, since the case relies on a notch above the keyboard (like many Nexus 7 cases) to keep the tablet stationary.

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