Daily painting - using up paint

After adding a new colour (or two) to the stripey painting, I use a palette knife to apply the leftover paint to "the wrinkly one" - you might identify the new colour from those visible at the edges of the painting.  The folds catch the paint, building up layers of colour -

If the layers were less thin, they might look rather geological when sanded down ... I have Mark Bradford's paintings in mind (aim high!) - close up they look like this, the sanding revealing the paint layers -