Primary cilia are hairlike protrusions from the cell bodies of most cell types in the body, that are thought to act like distinct organelles with a specialised signaling role, can dynamically change their length. Viviana’s perspective paper, written together with Eleni Leventea, discusses how these changes in length could dampen, potentiate, or skew signaling and therefore alter cellular responses. Given their widespread role in development and tissue homeostasis, cilia length changes are an important and potentially under-appreciated mechanism of fine-tuning cell state.