That's a nice example! Usually people's intuition between causation and correlation gets thrown off because they forget the impact of other variables in the cau

That's a nice example! Usually people's intuition between causation and correlation gets thrown off because they forget the impact of other variables in the causality network. Normally I've got examples for "correlation -/-> causation" but this is great for the other direction. It also reminds me wonderfully of a one-time pad.