Experiment in vision

When we look at an object our brain does not see it as a picture with every single detail. That would involve a huge amount of memory. Instead, the brain detects things like outlines and colour. A lot of what we perceive is assembled by the brain based on our past vision history. That's where this experiment comes in. If we have no information that tells us these cans are different then they will look the same. However, I know, and now so do you, that the can on the left is empty. Theoretically you will now perceive a difference between the two cans. I would be very interested to know how this works for you.

The fact that the cans are upside down or partly hidden by the velvet has nothing to do with the experiment. Opening the can left some marks on it and I was simply hiding them to make the cans look alike.