The cabin built and slept in by campers last summer needs a bathroom, fire sprinklers and smoke detectors.

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It detailed safety precautions such as keeping 24 fire extinguishers and 11 smoke detectors on hand.

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Until then, they were fairly boring things, with most people understanding how they worked only because their neighborhood streetlights went on when they sensed darkness, smoke detectors sounded alarms and fire trucks beeped because motion sensors understood when they were backing up.

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