Cover of Geometric Folding Algorithms: Linkages, Origami, Polyhedra by Erik D. Demaine and Joseph O'Rourke

(see Origami Maze Folder
and associated paper)

old poster
(see Origamizer and bunny video)

6.849: Geometric Folding Algorithms: Linkages, Origami, Polyhedra (Fall 2020)

Prof. Erik Demaine; Martin Demaine; TAs Yevhenii Diomidov & Klara Mundilova

[Home] [Lectures] [Problem Sets] [Project] [Coauthor] [Github] [Accessibility]


the algorithms behind building TRANSFORMERS and designing ORIGAMI

Whenever you have a physical object to be reconfigured, geometric folding often comes into play. This class is about algorithms for analyzing and designing such folds. Motivating applications include Major progress have been made in recent years in many of these directions, thanks to a growing understanding of the mathematics and algorithms underlying folding. Nonetheless, many fundamental questions remain tantalizingly unsolved. This class covers the state-of-the-art in folding research, including a variety of open problems, enabling the student to do research and advance the field.

Fully Online Format

Most course material is covered in video lectures recorded in 2010 (already watched by over 19,000 people), which you can conveniently play at faster speed than real time. There may also be some new material presented by the professor and/or guest lecturers, which will be recorded for asynchronous viewing.

But synchronous meeting time (also online) will focus on collaborative problem solving with your fellow students and the course staff. Particularly unusual is that the problems we'll solve in groups will include a choose-your-own-mix of problem-set style problems with known solutions, design problems for those who love to create, coding problems for those who love programming, and open research problems that no one knows the answer to, with the goal of publishing papers about whatever we discover. (Past offerings of this class have led to over a dozen published papers.) You can work on whatever type of problem most interests you. To facilitate collaboration, we'll be using our open-source software platform called Coauthor, along with Github for (optional) coding.

We recommend a drawing tablet for online collaboration, so be sure to apply for one if you don't have one. We'll be using a bunch of custom bleeding-edge open-source software tools for online collaboration, including our own Coauthor, Cocreate, and Comingle, which aim to reproduce the in-person experience as best as possible. Join us to help make this possible!


This is an advanced class on computational geometry focusing on folding and unfolding of geometric structures including linkages, proteins, paper, and polyhedra. Examples of problems considered in this field: Many folding problems have applications in areas including manufacturing, robotics, graphics, and protein folding. This class covers many of the results that have been proved in the past few years, as well as the several exciting open problems that remain open.


The textbook for the class is Geometric Folding Algorithms: Linkages, Origami, Polyhedra by Erik Demaine and Joseph O'Rourke, published by Cambridge University Press (2007). It is available for free from MIT libraries.

Additional recommended reading:


Synchronous Class Time: Mondays at 4:00pm–5:30pm Eastern and/or
Thursdays at 7:00–8:30pm Eastern
(For-credit students must attend at least one. You are encouraged to attend both if possible.)
Synchronous Class Room: online, using custom software
(Fill out the sign-up form and join the mailing list (see below) to get the link to the class.)
First Class: Thursday, September 3, 2020 at 7:00–8:30pm Eastern
Second Class: Tuesday, September 8, 2020 at 4:00–5:30pm Eastern
Office Hours: Monday evenings 10:00—11:00pm Eastern
Thursday mornings 10:00—11:00am Eastern
Professor: Erik Demaine, edemaine at
Co-lecturer: Martin Demaine, mdemaine at
TAs: Yevhenii Diomidov, diomidov at
Klara Mundilova, kmundil at
Staff Email: 6849-staff at
Units: 3-0-9
Prerequisites: 6.046 or equivalent background in discrete mathematics and algorithms.
Alternatively, permission from the instructor.
Credit: H-level and TCS AAGS credit
Requirements: • Watch all video lectures, measured by filling out Completion Forms.
• Watch recorded portions of synchronous classes that you didn't attend.
• Participation in synchronous classes, at least one per week (email 6849-staff about exceptions).
• Participation in discussion, measured as posting or being @mentioned in at least one Coauthor post each week.
Project write-up and presentation.
Problem sets roughly weekly.
Grading scheme: The approximate breakdown of your grade is 50% project, 20% project presentation, 15% psets, and 15% participation. But you cannot pass the class without participating (according to the fairly minimal requirements above).


We welcome both undergraduate and graduate students from MIT and its affiliated universities, as well as all universities in the Boston area. We generally welcome students from all universities, but in the online format, we need to ensure we don't grow beyond capacity, so all such students will need to request permission from the professor.

If you are interested in attending the class, for credit or as a listener, please do the following:

  1. Preregister if you're from MIT/Harvard.
  2. If you're not from MIT/Harvard, email Erik for permission.
  3. Join the 6849-students mailing list.
  4. Sign up for an account on Coauthor.
  5. Sign up for an account on if you don't have one (this is different from
  6. Fill out this signup form.

Previous Offerings

This class was offered in Spring 2017, Fall 2012, Fall 2010, Fall 2007 (as 6.885), and Fall 2004 (as 6.885). You might be interested in the lecture notes, problem sets, etc. from those offerings.