The lack of clocks is deliberate, I think the natural light is simply a case of it not being practical to allow it. Furthermore, the space around the gambling

The lack of clocks is deliberate, I think the natural light is simply a case of it not being practical to allow it. Furthermore, the space around the gambling areas is used for various business purposes, both to get gamblers to see the businesses and to get people to walk past the machines to go to the businesses. To put in windows would be to give up prime areas.