Put an employee at a desk in a cubicle without any sunlight and, over time, you can almost watch them shrivel and wilt from the seclusion. To some degree, their motivation with atrophy. Like flowers, they need a sufficient quantity of the nourishing rays of sunlight. And, for sunlight, you need windows – clean windows that enhance productivity.

Once you let the sunlight in, keep in mind that it will shine on your employees, as well as their surroundings. Cluttered and dirty, their surroundings may do better in the dark. But, relatively neat, organized and with just the right sense of comfort (comfort that makes them feel at ease without putting them to sleep) the sunlight coming through the windows can produce an environment that is conducive to greater productivity. It can even help increase employee retention.

If the workplace is somewhere people enjoy coming to work, they’re more likely to want to keep coming. And, they’re also more likely to be productive.

This is not an abstract idea. A study in Psychology Today “links light exposure in the workplace to improved sleep and vitality.” The article also refers to a Northwestern University study that reported on “the detrimental impact of working in a windowless environment.”

Once you’ve accepted the idea that sunlight can improve the demeanor and productivity of your employees and, therefore, have also accepted the value of windows to let the sun shine in, it’s not much of a stretch to equally recognize the value of keeping those windows clean.

Dirt on the windows is not an appropriate filter for sunlight. The positive effects of windows on productivity are not enhanced when employees glance though dirty windows.