I often find myself thinking about 'what I think about' and the irregular periods of intense engagement versus a general indifference associated with any given topic. I've tried to mentally model this dynamics in various ways (sinusoidal - maybe its just an up and down kind of thing?, diffusion - do I gradually bleed out from one idea to another?) but have never quite been able to put a finger on it. There are too many irregularities, too uneven of intervals between one engagement versus another.
Then I came across a piece by Paul Griffith that presented another analogy: falling in love.