Hi, I’m Barnaby and this is where my digital scribbles reside
This site began as a photo scrapbook.
It has since evolved into an online journal where I share my writing – publishing helps sharpen my thinking.
It’s also a place for resources I want close at hand …and anything else I become oddly passionate about
As you’ll see, I’ve developed quite the collection of unusual interests.
Thanks for visiting my corner of the web.
Bali, 2024
Visualised Mental Models
Charlie Munger championed the idea that with 80 to 90 mental models you could better navigate the world. To learn these I visualised those he used.
The Coffee Log
Ongoing log with ratings of every coffee I’ve tried. Mostly Indonesian Single Origin Focused with 70+ ratings from 20+ roasers
Browse the essays
The Multi‑Trillion Dollar AI Compute Bet
Big tech are making a huge bet on AI Compute. Whether this pays off is the key investment question of 2025.
On Trump’s Tariffs
Economists and Businessmen invoke Ricardo – trade should flow where it’s cheapest. But look closer, and most countries don’t play by the free trade rules they advocate.
Following the money in AI
Learnings from five podcasts featuring Jensen Huang, Satya Nadella and others in early 2025
The Electricity Economy
Why Electricity is the New Battleground for Global Competitiveness
Business Breakdown: Fiverr – a 2 sided freelance marketplace
Analysis of Fiverr’s financial, commercial and operating model.
AI Stack Economics
Exploring the AI value stack: From compute hardware to end-users, where will the greatest value accrue in this evolving landscape?
photography
Galleries
Notes from
Read More
Visualised Mental Models
The Pareto Principle
A minority of inputs often drives a majority of outcomes. Find the vital few, focus there first.
Circle of Competence
Operate where you truly understand cause and effect; stay inside the circle, expand it deliberately, and partner outside it.
Eisenhower Matrix
Prioritise by importance, not urgency: Do, Schedule, Delegate, or Eliminate.
The best Indonesian beans
The Coffee Log
I’ve been keeping a log of every Indonesian coffee I brew — now over 70 single origins from 20 roasters across the islands. Each page notes the basics (origin, process, roast), but also the stories: how it tasted to me, what the roaster says, and where it came from. It’s a growing directory of coffee from the archipelago, one cup at a time.
