Life makes you see a lot of colors. Like you would go through depression. You would expect people to behave with you. You would expect life to be fair. And life goes on and on. And nothing good would come out. Each of such stuff leads to the answer different than what we seek. And this means life is not monochrome.
Some of the people live life in a cage what their parents, their spouse and their nation has built around them. So for them monochrome color may be felt. And that would make them get into anxiety. And life kind of works in that state unless some other person paints different color in their life as such.
God sometimes appear as a painter. Some people get moksha out of this life due to his art. Some get trapped as if this life becomes hell for them.
Karma and moksha are those things which makes you believe God indeed is a painter.