A beige door with a visible gap along the edge, set against a tiled floor, with a brown teddy bear tucked in the corner - Victoria Kotlyarchuk /Getty Images Walk into almost any home, and you'll ...

Public restroom doors have gaps for specific reasons. These gaps aid faster cleaning in busy places. They allow quick response during emergencies. The design helps reduce misuse and is cost-effective.

Walk into almost any home, and you'll notice something strangely consistent: the interior doors never quite meet the floor. There's always that thin strip of space at the bottom, a gap that seems ...