Chemical analysis of the different paint types might tell you which were the earliest or tell you that the floor paint is very different to that on the front or the back of the canvas. You might have problems phasing things from their dirrect physical relationships to each other so would look for scientific dating evidence. You might even identify three different artists from the way they used the paint.
Of course your interpretation might get it wrong but as you will have produced a detailed record of your analysis someone else might be able to reinterpret.
If a canvas was laid in wet paint it would leave a faint depression. The way the paint on the front and back of a painting relates to the canvas and its stretchers would tell you which side was painted first. So yes physical releationships are clues to temporal releationships.
Of course your interpretation might get it wrong but as you will have produced a detailed record of your analysis someone else might be able to reinterpret.
If a canvas was laid in wet paint it would leave a faint depression. The way the paint on the front and back of a painting relates to the canvas and its stretchers would tell you which side was painted first. So yes physical releationships are clues to temporal releationships.