I spent a year reading books in clusters of 3 instead of one at a time. Never going back.

Started this last February because I'd just finished my 4th book on habits in a row and realized I couldn't remember which book said what. The information had blurred into one gray paste. So I switched. Instead of reading one book at a time, I'd pick a topic and read 3 books on it in the same 4 to 6 week window. Different authors. Different angles. Same territory.

12 clusters. 36 books. Here's the honest report.

what worked better than expected:

• retention. massively. when 3 authors disagree about the same thing, your brain actually files the disagreement, which files the whole topic. one book alone gets absorbed as fact and then forgotten.
• I stopped trusting any single author. this is unambiguously good. Cal Newport looks different after reading Csikszentmihalyi and Anders Ericsson beside him. Not wrong. Just narrower than he presents.
• the third book in each cluster was usually where the insight lived. the first book gave me vocabulary. the second gave me contradiction. the third gave me the actual shape of the field.
• cross-cluster surprises. reading habit books, then economics, then evolutionary biology, I started noticing all three fields were arguing about incentives. they didn't know they were doing it.

what didn't work:

• fiction. tried this with 3 Russian novels in a cluster. they don't interact the way nonfiction does. abandoned after Anna Karenina and half of Crime and Punishment.
• clusters bigger than 3. tried a 5-book cluster on cognition. by book 4 I was skimming. 3 is the number.
• clusters across totally unrelated fields. reading a stoicism book, an economics book, and a physics book at the same time was just 3 solo reads with extra confusion.
• reading 3 books by the same author. that's not a cluster. that's a fan phase. I did this with Taleb and learned very little in books 2 and 3 that book 1 didn't already have.

the clusters that changed something:

• consciousness cluster (I Am a Strange Loop, The Master and His Emissary, The User Illusion). rearranged my entire model of mind.
• capitalism cluster (Wealth of Nations, Das Kapital, Capitalism and Freedom by Friedman). read them in that order and I stopped having a strong opinion about capitalism, which is progress.
• decision-making cluster (Thinking Fast and Slow, Superforecasting, Thinking in Bets). I now make bets on almost everything and my batting average is higher than I expected.
• ancient philosophy cluster (Meditations, Enchiridion, Letters from a Stoic). read on paper, took notes by hand in a notebook I ended up spilling coffee on so badly the last 15 pages are just brown.

the boring truths:

• I read fewer books this year. 36 instead of my usual 55ish. the retention gap makes the trade obvious.
• I finished maybe 80% of books I started, down from 95%. clusters make it easier to abandon a bad book because you already have 2 others on the same topic. sunk cost dies.
• I stopped keeping a Goodreads count. the number was never the point. clustering makes that obvious in a way the flat list never did.

what I'd change:

• would leave a week between clusters. did some back-to-back and the second cluster suffered.
• would pick books that disagree more. the strongest clusters had authors who actively argued with each other.
• would take cluster notes, not book notes. what I ended up wanting was a document per topic, not a document per book. I'm restructuring my notes now.

Reading in clusters is not a productivity hack. It's slower. It's less impressive on any counting metric. But if the point of reading is thinking better instead of collecting more, clusters win by a margin I didn't expect.

I'll do 12 more clusters in 2026. Already have the first one lined up: three books on memory. Suetonius, Frances Yates, and something modern I haven't picked yet.

Open to suggestions on that third one.