In 2020, Tatum initiated an intercultural project between Nusa Tenggara Barat and Sweden, demonstrating her commitment to fostering cross-cultural understanding. She was introduced to the Sacred Bridge Foundation through her former art teacher and, recognizing their shared vision and goals, promptly joined the organization as Head of Communication and Outreach.

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In this capacity, Tatum spearheaded the development and implementation of "Intra-Chromatic," an initiative under the foundation's intercultural dialogue domain. This program, a collaborative cultural exchange between Nusa Tenggara Barat and Sweden, was a joint effort by the Sacred Bridge Foundation (Indonesia) and Skövde Konstmuseet/Skövde Art Museum (Sweden).

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Despite encountering significant challenges during its early stages, the program benefited from consistent communication and collaboration with Skövde Art Museum, ultimately achieving remarkable milestones. In 2023, these efforts culminated in the groundbreaking "Intra-Chromatic" event at the National Museum of Indonesia in Jakarta, marking a pivotal moment in the program's success.