As biological datasets grow too vast and complex for human intuition to navigate, a team at the University of Basel has answered an old epistemological challenge: how do we see what we cannot imagine? Their software, Bonsai, organizes millions of cellular measurements into branching trees that preserve the true distances of high-dimensional space, offering scientists not a compressed illusion but a faithful map. In doing so, it has already revealed a hidden lineage of immune cells — a reminder that discovery often waits not on new data, but on the courage to trust a clearer picture.