Lewis O’Brien

Idea Illustrator | Mental Models & Behavioural Science

[Gurwinder @G_S_Bhogal]

A thread of useful concepts to equip you for 2026:

[Lewis O’Brien @mntlmodels]

@briandecoded Duolingo but for books

[Lewis O’Brien @mntlmodels]

your idea + my idea = new idea

[Lewis O’Brien @mntlmodels]

@tomaldertweets Shrinkflation

[Lewis O’Brien @mntlmodels]

Just found out my newsletter was featured by @readwise!

[Lewis O’Brien @mntlmodels]

@UltraLinx @dannypostma Any thoughts on the Xbox Ally X? Would be cool to see you cover it on release.

[Lewis O’Brien @mntlmodels]

You are what you do when no one is looking.

[Lewis O’Brien @mntlmodels]

@EricJorgenson @pnickdurham Usually agree with you Eric, but this is just plain wrong in my experience.

A single post brought me more than 700 new subscribers. Another brought me nearly 400.

Discoverability and engagement are far better for me over there than on any other platform.

[Lewis O’Brien @mntlmodels]

@UltraLinx Camera and battery life concerned me when I saw the renders, but it actually seems pretty well-rounded. The case options are quite unfortunate though.

[Lewis O’Brien @mntlmodels]

Just start.

[Lewis O’Brien @mntlmodels]

@tomaldertweets Wow, that's insane

[Lewis O’Brien @mntlmodels]

@nateliason @every Do you use the remote model or the local model?

[Lewis O’Brien @mntlmodels]

North Star Metric:

A key performance indicator (KPI) that you use to measure the performance of your business or progress towards your goals.

[Lewis O’Brien @mntlmodels]

Cathedral Effect:

High ceilings evoke feelings of freedom, abstract thought, and creativity, while low ceilings promote concrete thinking and focus.

[Lewis O’Brien @mntlmodels]

@G_S_Bhogal @oldbooksguy We are 'hard-wired' to be in awe of big things.

The same effect is seen in rooms with high ceilings. It's called the cathedral effect.

https://t.co/gKNGEthlhk

[Lewis O’Brien @mntlmodels]

Get your copy here:

https://t.co/JAcdbYVaEm

[Lewis O’Brien @mntlmodels]

I'm partnering with Derek Sivers to give away free physical copies of his latest book to my readers.

Read my latest post in the replies below to find out how to claim yours.

There's no limit to this offer, so share it far and wide.

[Lewis O’Brien @mntlmodels]

@thinkobelisk Agreed. There are many important ideas from Japan alone. I’ll be sharing more soon.

[Lewis O’Brien @mntlmodels]

Wabi-Sabi:

A traditional Japanese philosophy and aesthetic that finds beauty in imperfection, impermanence, and incompleteness.

[Lewis O’Brien @mntlmodels]

@PropaneFitness Are ‘Adam’, ‘Sean’ and ‘Leon’ in the room with us?