We have seen how multiple developmental trajectories and tissue homeostasis strategies enable organoid growth. These mechanisms are complex, interconnected, and operate at multiple biological scales, making them challenging to apprehend. This section examines how to simplify and better understand essential mechanisms of self-microfabrication. Waddington introduced simple representations of complex biological systems, named epigenetic landscapes 413 . We propose to extend the idea into hierarchical landscapes, describing organ formation across biological scales (Fig. ).