Memory palace makes spaced repetition physical

If one’s memory palace is populated by clusters of related items, then physical regions would be gateways to conceptual regions. What’s more, scheduling a spaced repetition session turns into the task of computing the optimal physical route for navigating the physical space, the traveling learner problem. An entire host of spatial metaphors can be rendered explicit. What does it feel like to be at an idea, to pass by an idea, to get from one idea to the next?