oh, I definitely believe that a part of the “I’ve been talking with my partner about a trip to Spain and now I’m seeing the ads about it everywhere” is experiencing frequency illusion.
another big part of the phenomenon is how predictable the human nature is in some ways. oh, you’re middle class with a steady income and it’s a second half of November, with the days getting shorted and the sun setting even sooner after the clocks have been adjusted? it’s super difficult to guess that you might be considering a vacation somewhere warm and sunny.