Thailand, long a crossroads of global movement and hospitality, is narrowing its welcome — halving visa-free stays from 60 to 30 days for tourists from 60 nations beginning September 15. The measure reflects a tension as old as open borders themselves: the balance between the economic warmth of invitation and the sovereign need to govern who stays, and for how long. Framed as a response to crimes committed by foreign nationals on Thai soil, the policy signals that even the most tourism-dependent nations will periodically reassert the terms of their openness.