By Carol Crotta, Houzz

These young homeowners, a pair of Harvard Medical School alums with a 10-month-old son, were full of ideas and ambitions for their 1850 Cambridge, Massachusetts, home. Under the skilled hand of interior designer Melissa Hammond, the ideas began to coalesce. “The theme that runs through the house was dubbed ‘Moroccan mathematical’ by the homeowners,” Hammond says, “and it is a perfect description of their style.” Using as starting points a collection of intricately patterned silk rugs the couple had purchased on a vacation in Turkey, strong geometric patterns, and a touch of bling courtesy of crystal and glass chandeliers and polished chrome, Hammond brought the complex design together in a dramatic fashion. “There’s cohesion,” she says, “not confusion.”

Houzz at a Glance
Who lives here: A young couple with a 10-month-old son
Location: Cambridge, Massachusetts
Size: 3,500 square feet (325 square meters), 3 bedrooms, 3½ bathrooms
Designer: Melissa Hammond of Hammond Design

An explosion of teal greets visitors who enter the house. Once the living room, the front room is now a music room. The homeowners love to play music and host guests for impromptu concerts. “We used a bold turquoise on the walls to play off the color in the rug that the clients had purchased while on vacation in Turkey,” Hammond says. It set the palette for the first-floor rooms, with lighter tones of the same color employed in the rest of the public rooms. The crystal bling begins here as well, with the dramatic chandelier adding glamour.

The music room’s dynamic 35-inch mirror reflects the strong teal wall paint.

The dining room, which has a two-point view into the music room, introduces the geometric pattern play and crystal accents that inform much of the house’s interior design. The hexagonal honeycomb-patterned wall used to house back-to-back fireplaces, which were covered long ago.

Hammond had the wall reframed and painted a lighter shade of the same blue as in the music room. From there the visual interest grows. Hammond used a series of interlocking 3-D wall tiles made from a plaster-like substance, spray-painting them the basic white used throughout the house. The blocks were then assembled and installed over the painted wall.

Since her clients do not like paintings on walls, but do love anything three-dimensional, the pattern wall “gives focus to the dining room. Otherwise it would have been kind of blah,” Hammond says. “It didn’t have the wow factor of the music room or family room. It needed a little something.” Keeping the furnishings palette quiet let the pattern wall take center stage. The linear crystal chandelier “adds that sparkle the clients love,” Hammond says.

The heart of the home is the family room, part of the newer two-story addition, which also functions as a casual living room with French-door access to the patio. It is a cozy place, with two leather couches, a wall-hung television, a gas fireplace and custom built-in shelving that flanks the fireplace. To see the geometric showstopper in this room, however, you just need to look up and appreciate the new hexagonal honeycomb plaster tracery ceiling. “The wife sent me a photo and asked, ‘What about doing that?’” Hammond says. “I told her, ‘Are you kidding? I’d love to do that.’”

Hammond contacted a company that usually does work in public historic properties such as the Massachusetts State House. “That was a big challenge,” she recalls. “Very big, huge. It is very labor-intensive.” Working from scaffolds, with laser levels set all over the ceiling, the artisans had to first ensure that the surface was perfectly level. “I had to come up with a design,” Hammond says, “and we had to tweak it a bit.” Once the hexagonal design had been set, the company made special molds. It took two months to complete the work, which extends across the adjoining kitchen as well. This nod to the past was given a touch of the modern with the crystal chandelier. The tracery ceiling was a splurge, Hammond says, adding that “it was totally worth it. Most people have a plain ceiling. But why not?”

The kitchen, which is adjacent to the family room and part of the newer two-story addition, shares the beauty of the tracery ceiling. To keep the focus on the plasterwork, and as a counterpoint to the room’s traditional look, Hammond opted for high-gloss white cabinets and white quartz composite countertops for a clean, modern take. The barest hint of color comes from the plate-glass counter backsplash and glass island front, both back-painted in the lightest shade of the first floor’s signature teal without going white. Since glass can read as green, Hammond chose low-iron glass that has the least green in it so it would not fight the blue tone of the paint.

The strongest color in the space comes from the column of turquoise bookshelves at edge of the pantry wall. “They have tons of books and absolutely love cookbooks,” Hammond says. “They wanted a space for them.” To keep the atmosphere light and airy, she added a run of narrow transom windows where the wall meets the ceiling. Hammond went with a Miele appliance suite with a built-in espresso machine to complete the high-tech look.

The homeowners wanted their master bedroom to be serene and quiet. With color palette cues taken again from a Turkish silk rug, the neutral hues signal a peaceful sanctuary, but not one without stimulation. The custom built-in book shelving system and nightstands around the bed — “very straight and rectilinear and calm, Hammond says” — were essential because both of them do a lot of reading for work and love to read for pleasure. She gave them lots of space, she says, “because they want plenty of space to be able to add more books.” The bit of necessary bling is found — not surprisingly — in an crystal chandelier.

If geometry accents the other rooms, it is employed full bore in the baby’s nursery. While the walls are quiet white, the ceiling fairly explodes with a blue and white Moroccan floral-pattern wallpaper — all the better for the baby to gaze at. “We picked wallpaper all day,” Hammond recalls. “Newborns love high contrast with shapes. He loved it from day one. He stares at it.” Fluttering against the revolving blue-sky ceiling is a visually delightful light fixture, Ingo Maurer’s Birdie’s Nest, featuring feather-winged incandescent bulbs that twirl out from the center. “It was a natural choice for a nursery. It was so whimsical,” Hammond says. “It’s that softness against the strong geometry — it all works together.”

Related: Browse Wallpapers

More pattern appears in the pale rug, the geometry of the bookcase and in the honeycomb hexagonal shelving above the crib, which echoes the hexagonal elements in the dining and family rooms. Custom blackout draperies and Roman shades control the light.

The third floor houses the husband’s sizable office and library. “He wanted a place where he could sit and work,” Hammond says. “He does a lot of collaborating with colleagues — they sit and talk and work out mathematical equations. Math is kind of a hobby for him. He likes to doodle and come up with things.” The cafe set offers a convivial work surface, but his work surface extends, quirkily, to the wall. He had brought to Hammond the idea of using the wall at the top of the stairs as a large whiteboard — he had seen a photo of something like it — so she covered the wall with whiteboard paint. Now he and his colleagues happily doodle with dry-erase markers, and the wall can be wiped clean for future formulas.

On the wall leading up to the third-floor library are high-gloss white wall tiles for a graphic pop.

The staircase up to the third floor, part of the original house, could easily have been nondescript. “The husband really wanted something that had some impact as you were coming up the stairs,” Hammond says. She decided to cover the whole wall with 3-D paper tiles. The sizable 18-by-18-inch fiberboard-like tiles come unfinished. Hammond mounted them to the wall to establish the patterns, caulked the seams and spray-painted them in high-gloss white. “They are fairly simple,” she says, “but they have a strong graphic pop.”

“This room was a mess, all chopped up into different rooms,” Hammond says of the third-floor space. It was completely re-engineered during the remodel, including the addition of a structural beam in the ceiling and a pair of skylights, plus new flooring to match the downstairs original fir.

Key to the space is the significant book shelving. The custom-built shelving, constructed in a strong geometric pattern, incorporate original side windows. Once the husband and Hammond decided to install it across the entire side wall and around the window frames, the two “had a lot of back and forth on the design, how they were to be spaced, where the vertical dividers would be located,” Hammond says. After several drafts, she hit upon a design he really liked.

Related: Install Shelves in a Geometric Fashion

She had assumed that the shelving would be painted white, but he had seen a photo of some done in black. “I said, ‘I really like this,’” she recalls. “I thought it was a good idea.” Covered in high-gloss black, which pops against the white walls, they give the space a decidedly masculine tone, which is reinforced by the strong repeating geometry of the almost-blackened chrome light fixture. As in other rooms, the color palette was drawn from the intricate Turkish rug; this one has neutral browns, tans and black.

This floor plan shows the home’s entryway, music room, dining room and a portion of the family room and kitchen.

Continuing through rest of the first floor, we see more of the dining room and kitchen, the mudroom, powder room, her office and the patio.

This plan shows the upstairs bedrooms, bathrooms and dressing room.