In rock climbing lingo, “projecting” means dedicating many sessions to working out a challenging route that’s right on the edge of one’s climbing ability. At my local climbing gym, I’d been projecting this tricky Orange V5 the hardest move, or “crux,” being a weird calf-hook scissor stance to match the final upside-down thumb press. The first moves I’d figured out in two sessions, but even after a month I was struggling to muster enough force through my hands at hip height to reposition my calf. Then, a funny thought: Winston, at eight months old, is projecting too! Except his project is gross motor function generally.