MCI has a large glass ceiling in the rotunda, which is renovated biennially, to check for possible hazards and risks, and to replace any cracked or possible dangerous glass. This glass ceiling can be seen from almost anywhere in the central section of the school, and is a staple of Middlefield culture. The ceiling also gives in light and provides it for the central wing as well, thus helping reduce MCI's environmental impact, and is one of the reasons MCI was certified a Silver Eco School.