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Your brain wasn't built to remember everything
Your working memory holds about four things at a time. You may have heard seven, from George Miller's famous 1956 paper, but later work, summarised by Nelson Cowan in a 2001 review, puts the limit closer to four, give or take one.
Four things is all you have to work with at any moment. Meanwhile you're having ideas, fielding requests, noticing things you want to keep and tracking tasks across several projects. There's far more coming in than the buffer can hold, and something has to give.
Most note-taking apps respond by promising perfect retention: capture everything, tag it, link it, build a second brain that never forgets. Gravity lets things go.
The working-memory tax
A thought you haven't written down takes up room.
Say you're in a meeting and you think of something to do later. Part of your attention is now holding onto that to-do while you try to follow the conversation. Then you think of a second thing. By the end of the meeting your attention is split across a handful of half-held items.
The real cost of not writing things down is less that you'll forget them and more that you spend effort remembering when you could be thinking.
Karpathy describes the payoff of his single running note: "When I note something down, I feel that I can immediately move on, wipe my working memory, and focus fully on something else at that time."
That relief is most of what capture gives you. You get the thought out of your head so your head can do something else.
Retrieval isn't the main event
Think about the last hundred things you wrote down. How many did you go back and search for? For me it's about one in ten. Most notes did their job the moment I wrote them, by taking something off my mind, and I never looked at them again.
That's the system working. The trouble starts when an app is designed around retrieval. If every note has to be findable, you get folders, tags and links, and each one adds friction at capture, which is the moment speed matters most.
Gravity puts capture first. When you open it, the cursor is already at the top of the stream. Retrieval is there when you need it, through search and review, and it's fine that most notes will never need it.
What happens to a note in Gravity
- You write it. It appears at the top of your stream.
- Time passes. New notes land above it and it drifts down.
- You review the stream, scrolling and skimming.
- If the note catches your eye, you rescue it. Swipe right and it's back at the top.
- If it doesn't, it keeps sinking.
- Eventually it's far enough down that you rarely see it.
Nothing gets deleted along the way. Your attention decides what's prominent. The notes you keep rescuing stay in view and the ones you never rescue fade into the depths, where search and a long scroll can still reach them.
It's forgetting with a safety net.
What's happening in your head
Things you meet repeatedly are easier to recall. That's the basis of learning, and spaced repetition apps use it deliberately, showing you flashcards at growing intervals so you keep them.
Gravity is gentler. It doesn't force repetition. It gives you chances to meet your notes again and lets your attention choose which ones to engage with.
When a note catches your eye on review, you pull it back into mind and act on it, and that retrieval makes it easier to recall next time. The notes you scroll past get nothing, and they fade the way unused memories do.
Your memory already works like this. Gravity makes the process visible and lets you steer it.
What about things I need but don't care about?
Some notes are important and dull: reference details, admin, things you'll need once and never want to think about.
Often the world will prompt you when the time comes. You need the login when you have to log in, and the meeting notes when the follow-up arrives.
Prefixes help with the rest. Start the note with ref: or admin: and search for that prefix when you need it. The note sinks out of your daily scroll, so it isn't taking up attention, and it's one search away when you want it. I've written more about prefixes.
The stream isn't meant to be an archive of everything. It's where you keep what's current.
The relief of letting go
Holding onto everything weighs on you. If every note is precious, every note makes a claim on your attention, the backlog grows, and the reading list gets longer.
Letting notes sink gives you permission to drop them. Not every idea needs following up, not every article needs reading, and not every half-thought needs developing. Some things were interesting for a moment and that was enough.
When a note sinks and you don't rescue it, you've correctly judged that it isn't useful to you right now. It's still there if things change, and you owe it nothing.
How it builds
Over time the top of your stream fills with notes you've found worth rescuing more than once. They've survived several rounds of your own filtering, so they reflect what you care about.
Your capture gets better too. You learn what tends to survive review and what tends to sink, and your sense of what's worth writing down sharpens. For the case for writing down more, not less, read record every thought.
Permission to forget
Note-taking apps have taught us that forgetting is failure, and that the goal is perfect capture, perfect organisation and perfect retrieval. Your brain doesn't work that way. It filters constantly and lets go of whatever isn't reinforced, and fighting that is tiring.
So capture quickly, review now and then, let your attention decide what matters, and let the rest sink. For more on why sinking works, see the psychology of sinking.