Devised in the 1940s by the biologist C. H. Waddington, the epigenetic landscape is a metaphor for how gene regulation modulates cellular development. As a scientific model, it fell out of use in the late 1960s but returned at the beginning of the twenty-first century with the advent of big-data genomic research because of its utility among scientists across the life sciences to think more creatively about and to discuss genetics.