diff --git a/sketch.js b/sketch.js
index 5ff8c46..aad33fd 100644
--- a/sketch.js
+++ b/sketch.js
@@ -11,8 +11,8 @@ const SURFACE_CIRCLES = 1;
 const SURFACE_EARTH = 2;
 
 let surface = SURFACE_CIRCLES;
-let physics = false;
-let skeleton = false;
+let physics = true;
+let skeleton = true;
 let polytope = false;
 let charge = -1;
 
@@ -58,7 +58,7 @@ function setup() {
   buttons_surface[surface].disabled = true;
 
   input_particles = document.getElementById("input-particles");
-  input_particles.valueAsNumber = particles.length;
+  make_particles(4);
 }
 
 function windowResized() {