The first things guests notice when approaching this Sonoran Desert home are the boxy basalt protrusions jutting from the exterior’s neat white walls. As they wander past the miniature cactus gardens, they enter the home and discover the warm wood ceilings overhead. And when they walk around the spaces, they take in a striking kitchen wall of stacked walnut stained in three shades, sleek modern furnishings and a drop-dead gorgeous view of Camelback Mountain.