Moonwalking with Einstein

I finished reading Moonwalking with Einstein by Joshua Foer a few weeks ago and learned a lot about memory from it. I was hoping to get some insight into how to improve my ordinary memory but all I learned were tricks to improve deliberate memory techniques. Not that the two are entirely unrelated but it wasn't quite what I was looking for. I do highly recommend as it's a well written narrative and educational (at least for me). It also pointed me to the Rhetorica ad Herennium among other assorted ancient and more modern books on memorization.