Form factor
天斬 / Tower gap
金 / Metal
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Tradition and practical correlate
A narrow slot between two towers in front of the home (天斬煞), like a blade — and in practice a wind-tunnel (Venturi) that accelerates gusts.
What the tool checks
Whether a narrow gap between tall buildings lies in front of the home.
What you can verify in person
Visit in breezy conditions and check gusts, the view through the gap, and how the entry feels.
Confidence and limits
The gap and wind mechanism are grounded; local wind depends on building height, spacing and weather.