# Fix notebook thumbnailer **URL:** \ **Category:** Feedback\ **Created:** [June 30, 2018, 2:20am UTC](https://talk.observablehq.com/t/fix-notebook-thumbnailer/934 "2018-06-30T02:20:22Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![RandomFractals](https://yyz2.discourse-cdn.com/flex030/user_avatar/talk.observablehq.com/randomfractals/32/759_2.png) [@RandomFractals](https://talk.observablehq.com/u/RandomFractals)\ **Post date:** [June 30, 2018, 2:20am UTC](https://talk.observablehq.com/t/fix-notebook-thumbnailer/934/1 "2018-06-30T02:20:22Z")
1 more from my 1st week of observables exlore: I think it’s cool that you can link to named cells like this: > **[Fibonacci](https://observablehq.com/@randomfractals/fibonacci)** > > with seed values: You can read more about Fibonacci numbers here: https://en.wikipedia.org/wiki/Fibonacci\_number fibs( ): How many Fibonacci Numbers would it take to get us to the Moon? Answer (in km): to Mars? Range: 54.6 - 225 million km to Venus?... However, your thumbnailer is out of sync. I believe others commented on this too. I’ve seen other devs putting pics on top of their notebooks to show the crème de la crème of their works and fool your beta thumbnailer. What I got for that last bit: ![toKuiperBelt](https://canada1.discourse-cdn.com/flex030/uploads/observablehq/original/1X/7143ed078d6a7307b0879a877ead207b4d5e061c.png) and actually expected this 🙂 ![fibsAstroPic](https://canada1.discourse-cdn.com/flex030/uploads/observablehq/original/1X/9b7557bd9e2432d4cdc854aee412a09126a54fd4.png) ---
**Author:** ![RandomFractals](https://yyz2.discourse-cdn.com/flex030/user_avatar/talk.observablehq.com/randomfractals/32/759_2.png) [@RandomFractals](https://talk.observablehq.com/u/RandomFractals)\ **Post date:** [June 30, 2018, 5:53am UTC](https://talk.observablehq.com/t/fix-notebook-thumbnailer/934/2 "2018-06-30T05:53:35Z")
…also would be nice to be able to 🔖 named cells and functions. I browsed through many 📚: on @system this week, and there is a lot of good content fans produced in the past 6 months, but for the most part I found myself clipping those ‘crouton of truth’ code bits as as I was going through them 🙂 after liking a few ---
**Author:** ![magjac](https://yyz2.discourse-cdn.com/flex030/user_avatar/talk.observablehq.com/magjac/32/525_2.png) [@magjac](https://talk.observablehq.com/u/magjac)\ **Post date:** [June 30, 2018, 6:30am UTC](https://talk.observablehq.com/t/fix-notebook-thumbnailer/934/3 "2018-06-30T06:30:56Z")
This is explained here: > [@Feature request: Supply a fixed thumbnail](https://talk.observablehq.com/t/feature-request-supply-a-fixed-thumbnail/248/5): > > The thumbnail daemon selects the first image, SVG or Canvas element that is at least 320px wide and 200px tall. If there is no such element, then the top part of the notebook is used (immediately below the title). When we improve our publishing flow, we plan on offering greater control over the thumbnail, as well as the title and slug. ---
**Author:** ![RandomFractals](https://yyz2.discourse-cdn.com/flex030/user_avatar/talk.observablehq.com/randomfractals/32/759_2.png) [@RandomFractals](https://talk.observablehq.com/u/RandomFractals)\ **Post date:** [July 2, 2018, 1:53pm UTC](https://talk.observablehq.com/t/fix-notebook-thumbnailer/934/4 "2018-07-02T13:53:37Z")
.@magjac makes sense. thanks for demystifying this part. ---
**Author:** ![RandomFractals](https://yyz2.discourse-cdn.com/flex030/user_avatar/talk.observablehq.com/randomfractals/32/759_2.png) [@RandomFractals](https://talk.observablehq.com/u/RandomFractals)\ **Post date:** [July 4, 2018, 2:56pm UTC](https://talk.observablehq.com/t/fix-notebook-thumbnailer/934/5 "2018-07-04T14:56:19Z")
actually I have to give @tom and @mbostock some props for pulling canvas snapshots into notebook links on site. Loving it! 🤟 > **[Using Apache Arrow JS with Large Datasets](https://observablehq.com/@randomfractals/apache-arrow)** > > Apache Arrow Introduction Apache Arrow Home: https://arrow.apache.org/ Apache Arrow JS on github: https://github.com/apache/arrow/tree/master/js Apache Arrow JS Import Import apache-arrow.js via require: Sample Arrow Data We'll use arrow data file... Now I wish linkedin and Twitter did the same thing when they gen. a post link 🙂 Bookmarking cells would still be nice. see 👆