An exhibition makes a central historical claim based upon one archival source. The source determines the dating, attribution and interpretation of several objects. If the document fails, the exhibition narrative must be rebuilt. Test it by subtracting the source. If the main argument survives unchanged, the citation was contextual. If the narrative collapses, it was a commitment. CitationalCommitment: https://socioplastics.blogspot.com/2026/05/socioplastics-507-citational-commitment.html DOI: https://doi.org/10.5281/zenodo.18475136