New mom–and Cape Town-based writer–Kerryn Fischer traded nappies for notebooks for her assignment in Johannesburg, South Africa. She found the indefatigable Gergory Katz and his wife to be as inspiring as their home: "They have lots of fingers in different pies, and are incredibly passionate people."

Katz's Cradle
Gregory Katz proves that three times is a charm with his trio of concrete homes, which challenge the status quo in this quiet...