Colours in motion

There's no better way to imagine a colour,
To take purple next to red and see the difference that makes them both.
I can move 360 in a globe of motion,
No limits to my range of emotion,
A tapestry a cacophony a never ending symphony,
Though at some point the colours have to drain,
And we're back to grey, black and white again,
Then we'll go again,
And again.