Faux skylights add Full Spectrum lighting to a windowless office! Elko Ingénierie is a construction engineering firm located just outside of Paris, France. In an effort to make the below-grade offices a little brighter and more comfortable, the firm installed several Luminous SkyCeilings. The virtual skylights provide a very realistic presence of overhead sky. Biophilic elements, such as these illusions of real sky, have proven to promote relaxation and comfort.