Physics
The sky appears blue because

All colours interfere to produce blue
In white light, the blue component dominates
It is actually blue
The atmosphere scatters blue colour more than the others

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Physics
Analog synthesis refers to a technology based on

Representing data in terms of measurable physical quantities.
Representing physical quantities as numbers.
Placing brief digital recordings of live sounds under the control of a synthesizer keyboard.
Interfacing synthesizer equipment.

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