Summer Circle
at James Madison University, August 13-17, 2018


The annual Summer Circle Packing Symposium brings together researchers and students working on problems related to Koebe-Andre’ev-Thurston-style circle packings, conformal maps, conformal tilings, and inversive geometry. The meeting is informal and is focused on fostering collaboration, making progress on current open problems, and identifying interesting new ones.

Participants have the opportunity to give flash talks on the first day of the workshop and the remainder of the workshop is comprised of relatively unstructured research collaboration. This year we are also piloting a tutorial series on special topics of interest to participants. See below for more information.

Topics of Interest

Topics of interest for the workshop include, but are not limited to:

  • Inversive distance circle packings and circle polyhedra.
  • Conformal tilings.
  • Algorithms for computing circle packings.
  • Conformal geometry.
  • Inversive geometry.
  • Applications of circle packings.

Date: August 13-17, 2018.

Schedule and Participants


Monday (ISAT/CS Building @JMU)

Morning: Arrival.

  • Meet at second floor of ISAT/CS, parking passes, informal discussions, etc.

Afternoon: Flash Talk Session 1.

  • 2:00-4:00p. Flash Talks (in no particular order).

Tuesday (ISAT/CS Building @JMU)

Morning: Tutorial Session1

  • 9-10a. Stimulus generalization: seeing circle packings (almost) everywhere. Ken Stephenson.
  • 10:15-11:15a. Inversive-distance circle packings, polyhedra, and frameworks. Philip L. Bowers.
  • 11:30a-12:30p. Koebe-Lib: A library for inversive geometry. John C. Bowers, Angelo Luna, and Maddie Brower

Afternoon: Tutorial Session 2

  • 2:30-3:30p. A Crash Course on Combinatorial Type. Bill Wood.
  • 3:45-4:45p. Hyperbolic and parabolic expansion complexes from a single subdivision rule. Bill Floyd

Wednesday (ISAT/CS Building @JMU)

Morning: Tutorial Session 3, Flash Talk Session 2, and Open Problem Session

  • 8:30-9:30a. CirclePack for dummies and the status of the algorithm. Ken Stephenson.
  • 9:30a-11:30p. Remaining Flash Talks (in no particular order).
  • 11:30-12:30p. Open Problem Session

Afternoon: Excursion

  • Excursion to Humpback Rocks and Blue Mountain Brewery.

Thursday (Start @ Shenandoah Joe’s Coffee)

  • Meet at Shenandoah Joe’s Coffee for informal research discussion.

Friday (Start @ Shenandoah Joe’s Coffee)

  • Morning: Morning coffee and informal research discussions.
  • Concluding Lunch


  • John C. Bowers (JMU). Almost all circle polyhedra are rigid.
  • Philip L. Bowers (FSU). Scaling limits of critical phenomena (percolation, LERW, UST, etc.).
  • Ellie Dannenberg (Pomona College). Circle Packings on Complex Projective Surfaces.
  • Bill Floyd (VT). Expansion Complexes.
  • Opal Graham (FSU). Rigidity of Configurations of Points and Spheres.
  • Angelo Luna (JMU). Escher: A programming language for tilings.
  • Dane Mayhook (ISU). Examining rotationally symmetric expansion complexes
  • Lorenzo Ruffoni (FSU). Complex projective structures and quasi-Fuchsian representations.
  • Ken Stephenson (UT Knoxville). Proton Pencil Painting.
  • Bill Wood (UNI). Types of type.


John C. Bowers (JMU), Philip L. Bowers (FSU), Madelaine Brower (JMU), Ellie Dannenberg (Pomona College), Bill Floyd (VT), Opal Graham (FSU), Thanittha Kowan (FSU), Angelo Luna (JMU), Dane Mayhook (ISU), Lorenzo Ruffoni (FSU), Ken Stephenson (UT Knoxville), and Bill Wood (UNI).

Accommodations and Locale

Harrisonburg, Virginia

Coming soon...

Suggested Restaurants

Coming soon...



ISAT / CS Building
James Madison University
701 Carrier Drive
Harrisonburg, VA 22807

Parking information

Coming soon…