BIASMAP is a crowd-sourced experiment that locates perceptions of bias and prejudice in time and space. Like the cholera maps of John Snow, BIASMAP visualizes expressions of prejudice in an attempt to draw out the spurious relationships and often hidden mechanisms of how irrational prejudice against the Other is transmitted, validated and institutionalized. By crowdsourcing perceptions, BIASMAP creates an atlas of qualitative data on the subject of prejudice, which can serve as a point of departure and inspiration for creative interventions and questions we may never have known to ask. Snow’s cholera maps did not just locate the origin of disease in a well, but the question which led to the discovery of microbes. The maps revealed something invisible to the naked eye. BIASMAP is a question, an open investigation into finding the spurious and invisible ways in which bias and prejudice spread.