I can't say categorically that "I hate waste". That wouldn't be true. But there is a compulsion in me to use every last bit of paint on my palette, even if it ruins the painting. So, I have found a way to satisfy that urge without causing damage: I take the disposable acrylic palette sheet and I turn it over a white page, and I press the colours down onto paper, forming big blobs of colour, that often look nicer than the original painting itself, and that you could use to carry out psychology tests. This one is particularly successful, with gorgeous bright colours.
And the fact that the sun was shining and my Christmas roses were casting a long shadow on the wall is just a happy coincidence