diff --git a/src/components/ConcernementMapItem.vue b/src/components/ConcernementMapItem.vue
index 4262da9..b38c7f0 100644
--- a/src/components/ConcernementMapItem.vue
+++ b/src/components/ConcernementMapItem.vue
@@ -327,6 +327,7 @@ export default {
       if (num > 1 || num < 0) return this.getGaussianRandom() // resample between 0 and 1
       return num
     },
+    // MATTER BODY
     initMatterBody (){
       
       // MATTER
@@ -338,18 +339,20 @@ export default {
         // INFO https://github.com/liabru/matter-attractors/blob/master/index.js
         // INFO https://github.com/liabru/matter-attractors/blob/master/build/matter-attractors.js#L180
         MatterAttractors.Attractors.gravityConstant = -20;
-        
+
         // Create parts of the body : main big circle & entities
+        // INFO map a range of numbers to another range of numbers https://stackoverflow.com/a/46462321
+        let entite_range = [3, 100];
+        let ray_range = [this.ray*0.8,this.ray*1.2];
+        let ray = ray_range[0] + (this.entites.length - entite_range[0]) * (ray_range[1] - ray_range[0]) / (entite_range[1] - entite_range[0]);
         this.body_parts = [
-          Matter.Bodies.circle(0, 0, this.ray, {
+          Matter.Bodies.circle(0, 0, ray, {
             item_type: 'concernement',
             id: this.concernement.id,
           })
         ];
         
-        // map a range of numbers to another range of numbers
-        // INFO https://stackoverflow.com/a/46462321
-        let entite_range = [3, 100];
+        // INFO map a range of numbers to another range of numbers https://stackoverflow.com/a/46462321
         let mass_range = [5,15];
         let mass = mass_range[0] + (this.entites.length - entite_range[0]) * (mass_range[1] - mass_range[0]) / (entite_range[1] - entite_range[0]);
 
@@ -1516,7 +1519,7 @@ export default {
     },
     onAfterEngineUpdate (event) {
       this.respawn();
-      
+
       this.paper_main_object.position = this.pos = this.body.position;
 
       // this.draw()