Some of the weaving

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@@ -111,8 +111,18 @@ For example, the cotton involves notably:
 As for the special man-made "monofilament" yarns, they undergo one of two similar processes:
 
 * Preform to fiber (see papers: [n1](https://www.nature.com/articles/s41598-018-26561-8), [n2](https://www.nature.com/articles/s41467-019-11986-0)) consists in pulling on a block of carefully crafted material that is driven to its glass temperature. This process allows functional components to be inserted inside of the fiber.
+  * Done at [AFFOA](http://go.affoa.org/)
 * Pellets to fiber processes typically material pellets that are then pulled into a fiber (e.g. [recycling plastics to fiber](https://www.youtube.com/watch?v=zyF9MxlcItw) and 3d printing filament)
 
+Notable applications include:
+
+* [Optical fiber](https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=6832#ad-image-0), typically pulled from a preform
+* Recycling plastics into garment fiber
+* 3D printing filament
+
+<iframe width="560" height="315" src="https://www.youtube.com/embed/AAczQv-WXZk" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+<iframe width="733" height="550" src="https://www.youtube.com/embed/zyF9MxlcItw" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+
 
 
 
@@ -120,10 +130,77 @@ As for the special man-made "monofilament" yarns, they undergo one of two simila
 
 ### <a id="weaving">Weaving</a>
 
+Terms:
+
+* **Warp**: vertical threads (columns / wales), as many as needed to cover the width of the fabric
+* **Weft**: horizontal thread (rows / courses), from one to multiple depending on the pattern
+* **Shedding**: the creation of a *shed* under which the weft thread goes, by pulling a selection of warp threads up
+* **Shuttle**: the device used to transfer the weft across the shed
+* **Heddle**: the individual eyelet through which each warp thread is pulled (up or not)
+* **Beating-up**: the process of compacting the weft to create a woven structure with correct tension
+
+<a data-caption="Alexandre Kaspar 2019">
+  <img src="images/topology_woven.png" width="400" />
+</a>
+
+Weaving is a parallel process through which one or multiple weft threads are woven in between columns of warp threads.
+At its core, the process consists of:
+
+1. Creating a shed by pulling a selection of warp threads up
+2. Inserting the weft across the shed
+3. Beating up the weft to compact it (and ensure its good tension)
+
+There are many variants of *looms* (the machine through which weaving is done) with various ways to select the warp threads (either in groups or individually),
+as well as various ways to transfer the weft across the shed (e.g., manually or with a flying shuttle). 
+
+<a data-caption="The history and principles of weaving by hand and by power, Barlow, 1879, p. 82">
+  <img src="images/weaving_diagram.png" height="400" />
+</a>
+
+For an introduction to weaving, see "The history and principles of weaving by hand and by power", Barlow, 1879.
+Available on [archive.org](https://archive.org/details/historyprinciple00barluoft/).
+
+For a more modern reference, see "Shuttleless weaving machines", Talavasek, 1981.
+
+<a data-caption="Heddles, by Loggie-log, public domain" href="https://commons.wikimedia.org/w/index.php?curid=3635894">
+  <img src="images/weaving_heddles.jpg" height="400" />
+</a>
+
+One inconvenience of weaving machines is that they require a complex setup to prepare the warp threads (easily thousands of them) and their tensioning, before anything can be done.
+
+<a data-caption="(c) Alex Zimmer, 2018">
+  <img src="images/weaving_warping_machine.jpg" width="800" />
+</a>
+
+
 ### <a id="lace">Lace</a>
 
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 ### <a id="knitting">Knitting</a>
 
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+### <a id="crochet">Crochet</a>
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+
+### <a id="knotting">Knotting</a>
+
+The art of making knots.
+Knitting / crochet, not with loops, but with knots.
+
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+
 ## Credits
 
 This recitation was crafted by [Alexander Zimmer](https://www.kniterate.com/about/), [Carmel Snow](http://www.carmelsnow.com/) and [Alexandre Kaspar](http://w-x.ch).