Walking into the upstairs offices of Studio Santalla in Georgetown on a warm, sunny spring day this week, it’s clear that different people designed the exterior and interior. You climb an almost fire escape-like set of outside steps to get to the nondescript door but upon entering the spacious office a different vibe emerges. There’s one mammoth room with a day bed and coffee table in the entry way, a conference table nearby and a fleet of desks on one side of the room while large protruding bookcases built into the walls on the other side jut outwards in perfect synchronization.Santalla, whose work is contemporary, uses the office to illustrate one of his design principles: welcoming rooms should create a sense of calm. He points to blinds on the windows that form large white rectangles. They’re echoed on the floor in swatches of white carpet that divide the room. They appear again as doors on the ends of the bookshelves.“It doesn’t hit you over the head, but your mind reads it and it’s unconscious and you say, ‘Oh, this is a well-organized space,’” Santalla, 49, says. “And so that’s part of how we use colors and materials to create a sense of calm. You’ve come in from the outside where you’re on information overload. In here is more of an oasis.”