# Articles and Tutorials

## How to Play with Twist Blocks

Posted by **Madonna Yoder** on

What are twist blocks? Whenever I look at tessellation crease patterns, I mentally break them up into their component parts. With twist-based tessellations, those parts are twists and they're connected by pleats. The good news is that the same set of twists are used over and over again in different tessellations, which means that we can treat them like building blocks and drag and drop to snap them together! I made a set of digital twist blocks in both square and triangle grid for my Tessellations by Tiles students last fall and found that they really speed up the diagramming...

## Lens Garden Origami Tessellation

Posted by **Madonna Yoder** on

Fully Flexible Sometimes when you're thinking about tessellations, often when you're looking at what someone else has folded, you have a flash of insight and see new possibilities for patterns that you hadn't considered before. That's exactly what happened when I was looking at Miguel Gañan's book, Twist and Tess, when I first got it. I was looking through the crease patterns for interesting tilings, and came across a pattern that used the hexagon-rhombus-triangle-rhombus loop (which is usually very restrictive) in an expanded form that has specific places where the spacing is very variable! Immediately, I thought of Lens...

## What's a Tiling - and why does it matter?

Posted by **Madonna Yoder** on

I addressed this very question in this week's livestream, which you can see here: Tilings are the roadmap for where pleats go and what they connect in a tessellation. They're also the level of analysis that's most beneficial for folding and designing. After all, if you know that a particular hexagon in a pattern is in a position of 6-fold rotational symmetry and you know one of the things that goes next to it, then you know all of the things that go next to it! Thinking in terms of tilings and symmetries allows you to generalize and describe...

## Purl Origami Tessellation

Posted by **Madonna Yoder** on

Patterns in the Tessellation You can see many things in any tessellation - here I'm seeing a close mimic of the purl knitting stitch, and also an Easter bunny. I'm also seeing parallel mirror symmetry lines with a string of twists between them, a sequence of triangle-rhombus-triangle that I use in many tessellations, and an unusual arrangement of rhombi and triangles. Which aspect I choose to emphasize varies with the lighting, the level of zoom, and who I'm talking to. Details As we look closely at this tessellation, we can see that there's the zigzagging rhombi and triangles,...

## Triangle Grids on Rectangles

Posted by **Madonna Yoder** on

There's plenty of tutorials out there for folding triangle grids on squares, but the translation to folding these grids on rectangles in the orientation of your choice isn't well known. That's why I went live this week to talk about these grids - and why you might want to use them. We often think of triangle grid tessellations with 6-fold symmetry that work well on hexagons, but there's also tessellations on triangle grids with dominant 3-fold or 2-fold symmetries too! In the 2-fold case or cases with one direction of mirror symmetry a rectangle is often the shape that...

## Hybrid Closed Islands Origami Tessellation

Posted by **Madonna Yoder** on

Tiling Surprise Believe it or not, Hybrid Closed Islands has the same tiling structure as Robin Scholz's Celtic Circle. Both of these tessellations feature twists with six pleats (hexagon twists) surrounded by twists with three pleats (triangle twists) and vice versa. However, when you look at Hybrid Closed Islands it's easy to see only triangles - because the six-pleated twists only have three-fold rotational symmetry. Centering Choices In this tessellation, I have three equivalent choices of what to put in the center, and whatever I put in the center will be emphasized in the pattern. Each of these three...

## Triangle-centered grids on hexagons

Posted by **Madonna Yoder** on

The more I fold grids, the more I realize that the possibilities are endless.

For example, I used to think that triangle grids on hexagons could only be centered on grid intersections - that I had to start by folding the hexagon in half in one way or another.

## Knotted Web Origami Tessellation

Posted by **Madonna Yoder** on

If you're already familiar with isoarea tessellations, you might notice something unusual about this one - it uses hexagon twists!

Most of the time you'll see isoarea patterns in tessellations with all the same kind of twist - squares, equilateral triangles, right triangles, and occasionally rhombi.

## Origami Tessellation Terms and Definitions

Posted by **Madonna Yoder** on

While you may already be familiar with origami terms like mountain and valley folds, sinks, squashes, swivels, and rabbit ears, tessellations have a vocabulary of their own. Unfortunately, the vocabulary of tessellations is not standardized across all tessellation designers and each tessellation book uses different definitions - and different colors and symbols for their diagrams. This can make it hard to learn, since everyone is saying things in different ways. I try to stick to consistent definitions throughout my teaching, and to explain my terms in plain English - no math speak. Here's my list of the most important terms to...

## Stars in Stars Origami Tessellation

Posted by **Madonna Yoder** on

In the beginning, everyone learns origami from someone else.

As you become more advanced, you may start to rely more on recorded tutorials, books, and other diagrams.

At some point, you start creating your own designs - and then how do you learn more?

## Emergent Hexagons Origami Tessellation

Posted by **Madonna Yoder** on

Serendipity There are some things that you can't know in advance. In the garden I can know what I planted and where, but not when it'll come up or how many plants will survive. In tessellations I can know my symmetry pattern, know what twists I'm using and in what spacing, but still not know what will emerge from the backlighting. In both cases, the end results are often more beautiful than we could have planned for. In both cases, I like to space things close together to see what happens. I'm often pleasantly surprised in the garden, just like...

## Hybrid Lattice Origami Tessellation

Posted by **Madonna Yoder** on

The hybrid square twists that it's made of can be folded in one of two ways, making this twist a binary pixel.

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- Tags: hybrid square, origami, rotated

## Rotated Grids Challenge Winner

Posted by **Madonna Yoder** on

## Rotated Grids: A Practical Guide

Posted by **Madonna Yoder** on

So, you've seen the math behind rotated grids but you're still confused about how to *actually* use them for your patterns. You aren't alone and you're in the right place.

## Rotated Grids Challenge

Posted by **Madonna Yoder** on

## Rotating Grids in Squares and Hexagons

Posted by **Madonna Yoder** on

## Compound Quadrilaterals Tessellation Tutorial

Posted by **Madonna Yoder** on

## Compound Squares Live Tutorial

Posted by **Madonna Yoder** on

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- Tags: compound square, origami, tutorial, video

## Open Compound Square Twist Tutorial

Posted by **Madonna Yoder** on

## Christmas Stocking Tutorial

Posted by **Madonna Yoder** on