La fripe du nord au sud. Recyclage, commerce et consommation

Groupe du colloque d’Efren Sandoval

Les 4 et 5 avril 2017 a eu lieu le colloque international « La fripe du nord au sud. Recyclage, commerce et consommation », coordonné par Efrén Sandoval Hernandez (CIESAS, Mexique), résident 2016 – 2017 à l’IMéRA.

Plusieurs spécialistes de divers horizons disciplinaires, et des acteurs du monde de la fripe qui travaillent dans différents pays, se sont réunis pour la première fois dans l’objectif de mettre en avant les enjeux écologiques, économiques et sociaux liés au recyclage, au commerce et à la consommation de vêtements usagés. Il s’agit d’un phénomène largement développé dans le monde et qui implique la participation de divers acteurs au sein de réseaux internationaux. Ces derniers organisent « par le haut » et « par le bas » le passage de tonnes de vêtements usagés au-delà des frontières et des océans.

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Les “Rendez-Vous de demain : Comment les sciences éclairent l’avenir ?”

Présentation des “Rendez-Vous de demain” le 14 septembre 2017 au théâtre du Gymnase.

Avec les interviews de Thierry Fabre (Organisateur des Rendez-Vous de demain et Directeur du programme Méditerranée de l’IMéRA), d’Yvon Berland (Président d’Aix-Marseille Université), de Dominique Maraninchi (Président de l’IMéRA) et de Stéphane Paoli (Journaliste et modérateur des “Rendez-Vous de demain”).

Les Rendez-Vous de demain sont un cycle de six rencontres autour des Sciences qui se dérouleront au théâtre du Gymnase à Marseille pendant la saison 2017/2018. Sur une idée originale de Thierry Fabre et de l’IMéRA, ces rendez-vous seront animés par le journaliste Stéphane Paoli. D’où est venue l’idée de ces rencontres ? Pourquoi sortir de l’Université et organiser ces rendez-vous dans un théâtre ? Regardez la vidéo pour en savoir plus.
Réalisation : équipe 15-38 Réseau Med
Journaliste : Hélène Bourgon
Images et montage : Coline Charbonnier
Animation : Justin de Gonzague

Conférence de presse des “Rendez-Vous de demain : Comment les sciences éclairent l’avenir ?”

Vidéo intégrale de la conférence de presse des “Rendez-Vous de demain”, enregistrée le 14 septembre 2017 au théâtre du Gymnase.

Avec la participation de : Dominique Bluzet (Directeur des théâtres des Bernardines, du Gymnase, du Jeu de paume et du Grand théâtre de Provence), Yvon Berland (Président d’Aix-Marseille Université), Dominique Maraninchi (Président de l’IMéRA), Julien Ténédos (Responsable de la Communication du RFIEA), Stéphane Paoli (Journaliste et animateur des Rendez-Vous de demain) et Thierry Fabre (Organisateur des Rendez-vous de demain et Directeur du programme Méditerranée de l’IMéRA).

Les Rendez-Vous de demain sont une série de rencontres publiques produites par l’IMéRA et le théâtre du Gymnase, avec le soutien du RFIEA (Réseau Français des Instituts d’Etudes Avancées) et de la Fondation A*MIDEX, qui porte l’initiative d’excellence d’Aix-Marseille

Mathematical Feelings of Space

IMéRA and FRUMAM, Marseille
10-11 October


Edmund Harriss, University of Arkansas, IMéRA
Pierre Arnoux, Aix-Marseille Université

If you are interested in coming please contact us so we can have a rough idea of numbers, also please contact if you are interested in giving a short presentation (5mins) on the second day.

The notion of space is a broad and complex one, in mathematics alone the word is used in many different ways. It can be regarded as one of the central motivating concepts, for the subject, as Poincáre said mathematicians

must aid the philosopher to fathom the notions of number, of space, of time.

Too often mathematical ideas about space and the different ways it can be perceived are buried under the algebraic notations that gain control of the ideas. Yet the mathematical approach, in large part because of this control, is able to distinguish many different flavours of what we might consider “space”.

The aim of this workshop is to bring together mathematicians of various disciplines with artists and scientists to explore the different ways we feel and understand space, in two directions : how the mathematical understanding allows us to express precisely many different common intuitions about space (continuity, discreteness, dimension, tangent line, shape, distance…), and also how logical exploration of mathematical concepts allows us to experiment with new intuitions never seen or felt before, for example, hyperbolic spaces, tiling spaces, Lie Groups, fractals, Cantor sets, Peano curves, devil staircases, p-adic numbers…

The workshop will be held over two days (10-11 October 2017), with time for discussion and conversation. The schedule is flexible on the 11th with space for quick talks and small group discussions. All participants are welcome to suggest a short (5min) talk for the morning on the 11th, or a question or discussion topic for the afternoon.



The gate to the St Charles Campu sis just down from the station to the North. We will have someone at the gate, and they have a list of registered participants. After going through the gate turn right and go as far as you can. Take the door in the corner on your left, FRUMAM is on the second and third floors.

Map for FRUMAM

for IMéRA:

You can enter from either the gate on Place LeVerrier or next to Parc Longchamp. If you come through the gate at LeVerrier climb the hill we will be starting in the Maison des Astronomes. If coming from the gate by Parc Longchamp, head straight on and slightly down the hill to get to the same place. Lunch and the afternoon sessions will be in the new building (the long building up the hill straight out of the Maison des Astronomes.

Mathematical Feelings of Space: Schedule and Abstracts

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October 10 at FRUMAM

9:00 Accueil/Reception
9:30 Edmund Harriss Introduction
10:00 Peter Davidson Sir Thomas Tresham (1541-1605) Catholic Recusant, amateur architect, and numerologist
11:00 Arnaud Chéritat Exploratory experiments at representing geometric notions virtually and/or physically
12:30  Lunch
14:00 Pierre Berger Esthetopy
14:40 Paul Prudence  TBA
15:00 Alison Martin Crafting Complex Structures
15:30 Break
16:00 Jean-Paul Allouche Local versus global in mathematical and non-mathematical spaces
16:40 David Lasnier  Various Small Spaces
17:20 End

October 11 at IMéRA

In the morning there will be short 5min presentations on a variety of topics, all participants are encouraged to present. These presentations will be filmed. In the afternoon everyone will join a small group for a discussion of a topic (the topic suggestions will be finalised on the 10th). After an hour for discussion each group will have a second hour to prepare a presentation for the whole group.

9:30 Accueil/Reception
10:00 Quick (5min) presentations
11:00 General discussion and preparation for afternoon
12:30 Lunch Buffet
13:30 Unconference groups 1: General discussions
14:30 Break
14:45 Unconference groups 2: Prepare presentation
15:45 Break
16:00 Reports from small groups to whole group
17:00 End


Peter Davidson: Sir Thomas Tresham (1541-1605) Catholic Recusant, amateur architect, and numerologist

Thomas Tresham was a landowner, Catholic Recusant, amateur architect, and numerologist. He laid out at least one ambitious garden at Lyveden (which is being restored) and built two high symbolic and number-based buildings, Rushton Triangular Lodge (1593) and Lyveden New Building (abandoned 1605). It is these spaces which I would like to show, and on which I would invite mathematical enlightenment.

I will explain something of the context of number as symbol in English renaissance culture in particular and in renaissance culture more generally. Tresham was clearly most interested in numbers and spaces. As a Catholic gentleman he was, after 1560, technically or actively on the wrong side of the English law. He was imprisoned for long periods of “preventive detention” during which he planned his intricate and allusive symbolic buildings. He also left still-unsolved sets of number-jottings relating to his buildings.

I don’t; think his works have ever been seriously considered by mathematicians. It may be that (given the circumstances in which they were made) his number jottings may only be mysteries for their own sake, transposition-based codes involving randomly “significant” dates, or simply renderings of letters as number. In which case we’ll know not to look further by the end of the discussion. Or there may be subtleties beyond the obvious games with 3 in the Triangular Lodge, and play with 4 and 5 at Lyveden New Building. I can show you measured drawings, estate plans and pages from his notebooks. It may all be nothing or it may be a wonderful something.

Arnaud Chéritat: Exploratory experiments at representing geometric notions virtually and/or physically
In the last few years I have been using 3D printers, 3D modelling software and 2D and 3D web browser technology to represent some geometric objects including :
  • immersed surfaces in 3D and eversions
  • 2D hyperbolic space
  • 4D polytopes

In this talk I will make a short review of these experiments together with a few comments on a selection of key aspects in implementing them.

Pierre Berger: Esthetopy
The exhibition esthetopy was presenting several artworks and installations. They were designed to offer new sensitive explorations inside (imaginary) mathematical spaces  still misunderstood. Some of these artworks was created during different collaborations with the artists Pierre-Yves Fave, Sergio Krakowski, Vincent Martial and Jimena Royo-Letelier. Others gave answers to problems of Thurston’s School at the Geometry Center. Website: and
Alison Martin: Crafting Complex Structures: Bending, folding, cutting and pasting – to make mathematically inspired shapes.
Versions of complex patterns seen in nature can be generated with weaving and iterative construction techniques using simple materials and a low-tech approach.
Deconstructing space into simplified topological constituents; working with vertices and edges and modifying their connectivity offers a visual language and insight into how patterns appear from the inside out. The slow, repetitive process of hand building physical models allows unexpected connections to be made and provides tactile understanding and practical insights into spatial concepts.
Jean-Paul Allouche: Local versus global in mathematical and non-mathematical spaces

We try to underline the opposition-convergence between local and global properties in mathematics, but also in current life where global knowledge is discouraged through a systematically (and probably non-innocently) imposed local vision.

David Lasnier: Various small spaces

Some of my art projects deal with simple, yet paradoxical notions of space.They may sound ridiculous on a local scale, but make sense on a planetary or interplanetary scale. I like the idea that you have to mentally project yourself in a huge scale to understand a small object. The first part will be just a presentation of such projects as a list.
On the second part of my speech I will focus a little longer on two ongoing, more mathematical projects, one involving self avoiding hamiltonian paths and another one geometry of paper folding.