Like Wings, Your Hands

Kalina, born in Bulgaria and now living in Boston, has always been a spiritual seeker. Her fourteen-year-old son, Marko, who has spina bifida and is partially paralyzed, shares her curiosity about larger metaphysical questions, but also has his own unique perspective on life: Marko perceives numbers as having colors, shapes, and textures—and they’re linked to emotions: embarrassment, for example, is fourteen; satisfaction is sixty-seven.

Kalina is determined to respect her son’s dignity and...