When these mill buildings were constructed in 19th century, natural light was the source of illumination. It flowed through countless panes of glass. Floors were necessarily kept open so light could infiltrate. Work ceased when darkness descended.
In the 20th century iteration of the factory, electric lighting allowed spaces to be confined. Fluorescent tubes proliferated at the Sprague Electric Plant.
With the renovation of Building 6 the spaces were reopened then reconfigured for the 21st century version of the former textile factory - as MASS MoCA.
