You may wonder why an elegant version of an industrial shed would be appropriate for a new Innovation Lab at a private elementary day school—it seems to be a down-home kind of architectural expression for an affluent section of North Dallas. But the Lamplighter School’s history goes far in explaining how the design for the new lab came to be developed by Marlon Blackwell Architects (MBA), of Fayetteville, Arkansas, a firm known for being attuned to regional forms and materials.