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Space does not exist fundamentally: it emerges somehow from a more fundamental non-spatial structure. This intriguing claim appears in various approaches to quantum mechanics and quantum gravity. The goal of the talk is to show this apparent emergence does not commit to a stratified picture of the natural world with levels of reality. Trans-categorical mereology, may be used to interpret space and spacetime emergence in the background of a flat ontology. We can make sense of space emergence without subscribing to a picture of the natural world stratified in layers of reality, the non-spatial layer being more fundamental than the spatial one. The view will be described in relation to two particular researches programs: wave function realism and loop quantum gravity.
