diff --git a/README.md b/README.md
index a6ee57d..aee6c8c 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,14 @@
 # scad-projects
 My OpenSCAD experimentations, 2D and 3D shapes.
+
+OpenSCAD is a very useful app to create 2D and 3D shapes from textual definitions. You can then export images, SVG for printing  or 3D formats for 3D printers.
+
+## Flexaedre "HyperQBS"
+
+Comments are mostly in french in this one.
+I made 2 versions: one simple in 2D.  
+
+The 3D version is more experimental. I tried to (un)fold the shape reproducing real paper movements. While the concept is interesting, it requires more computations. I did it with one triangle, not sure I will continue for the others ...
+
+Donc bref, 2 versions du flexahedre: une simple en 2D. Une experimentale construite en reproduisant le depliage en 3D (bien qu'intéressante conceptuellement ca demande trop de calcul). 
+
diff --git a/flexaedre-2D.scad b/flexaedre-2D.scad
index 51ab534..dccb407 100644
--- a/flexaedre-2D.scad
+++ b/flexaedre-2D.scad
@@ -55,16 +55,16 @@ color ("Silver") {
 }
 
 // Optionnel (pour coller l'intérieur)
-color ("LightGrey") {
-
+color ("LightGrey") offset(delta=-1) {
+  
   translate([a,0,0]) 
     rotate(180-Aa-Ca)
     triangle_isocele(b, c);
 
-    rotate(-Ba-Ca-Aa)
+  rotate(-Ba-Ca-Aa)
     triangle_isocele(a, c);
 
-    rotate(-Ba)    
+  rotate(-Ba)    
     translate([b,0,0]) 
     rotate( -(90 +2*Ca -180) )
     triangle_isocele(b, c);
diff --git a/flexaedre-2D.svg b/flexaedre-2D.svg
new file mode 100644
index 0000000..c50034d
--- /dev/null
+++ b/flexaedre-2D.svg
@@ -0,0 +1,12 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg width="255" height="258" viewBox="-98 -99 255 258" xmlns="http://www.w3.org/2000/svg" version="1.1">
+<title>OpenSCAD Model</title>
+<path d="
+M 140.421,-98.0681 L 72.4427,-50 L 140.421,-1.93185 z
+M 70.7107,-50 L 0,-0 L 141.421,-0 z
+M 70.7107,70.7107 L 0,-0 L -14.6447,85.3553 z
+M 141.421,-0 L 70.7107,70.7107 L 156.066,85.3553 z
+M -15.5107,84.4893 L -1.51764,2.93185 L -97.0681,98.4823 z
+M 154.503,86.1018 L 72.4456,72.0229 L 113.877,158.773 z
+" stroke="black" fill="lightgray" stroke-width="0.5"/></svg>