Change blindness is a phenomenon that has been extensively studied for different purposes, even eye witness accounts in court. It occurs when a change is so subtle and gradual that it goes unnoticed. It is usually illustrated using one image that has been altered so that it is difficult to notice the changes. Images used for ‘spot the difference’ games in kids’ magazines are a good example of change blindness. In commercial janitorial services this is a challenge that flooring experts face. Sunlight and continued use of the tiles on the floor can bring this about. When you combine this with soiling and add the processes it takes to clean the floor, change blindness becomes a real problem. After months of wear and tear, one only needs to take a single look at the floor to realize that it is not what it was 5 months ago. There are ways, however, to make sure that you keep track of your floor’s degeneration. Here are a few tips that janitorial services use to spot the problem as it develops.