Time is colour? This is (more or less) the case: we see colours because of the different frequencies of light from objects - we're "detecting" the frequencies, or we're detecting the gaps between discrete "numbers", which are quantised bits of energy. The visible spectrum, for us humans, is a very small interval on a much bigger number line. We can feel, or measure the infrared part too, but not see what colour or hue it is. Then again, heat (or lack of heat) does colour our experience, or have an emotional effect, apart from a physiological one - heat stress proteins, etc. The colour of experience changes in cycles. There's a daily cycle of colour change - the sky starts out black, goes sort of grey/blue, and gets bluer and bluer, then changes back again. It gets less blue, and the horizon gets kind of purple, there's a gradation of colour in the sky, more apparent in certain parts of the day, and which part of the sky the Sun is moving through, if it's above or below the horizon, and so on. Whether there are a lot of clouds, and what kind - high or low clouds, or overcast so sunlight is diffused instead of a single source of light and heat. Time is coloured differently in different parts of a sidereal year, the seasons have different colours to them too. So asking yourself "what's the colour?" is closer to asking yourself the time than you might first realise. P.S. Could a timepiece that indicates the time (of day) with different colours do its job as well as one with two "hands" on a circular "face"? Why aren't digital watches (numeric displays) as popular as the clock-face-with-pointers "classic" style?
