I’ve had enough of buying paint which has been allowed to settle out and denature whilst standing on the shelf in a shop.
Today’s invention is a can that keeps paint or other (fluid) stirred.
The lid has a blade (or blades) attached with holes in it which will vary in size depending on paint consistency.
The can is stored on its side on a slightly sloping shelf.
Every time someone buys a can, the higher up ones roll down the slope and stir themselves a little.
For storage in a warehouse, the bottommost can can be moved to the top location on a known frequency so that a precise record of how stirred the paint is can be maintained.