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if a tree falls in a forest does it make a sound? if nobody could perceive colours would they exist? If i shut my eyes is the world still there? YES. our eyes pick up light waves travelling at certain frequencies bounced of objects, depending on the wavlength our brain relates to it as a colour, that's all it boils down to signals and receivers. if, one day, no one watched television would the signals sent out by the broadcasting houses still exist , yes. Colours are labels used to differentiate between different wavelengths of light.
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