diff --git a/Engine.cc b/Engine.cc
index b1a6051..a48b913 100644
--- a/Engine.cc
+++ b/Engine.cc
@@ -623,7 +623,7 @@ Engine::Object::Object(bool is_static, OdeWorld & world,
     m_is_visible = true;
     m_scale = 1.0f;
     m_is_scaled = false;
-    m_display_list = -1;
+    m_display_list = 0;
     m_display_list_refcnt = NULL;
     m_ode_object = world.createObject(
             geom_type == OdeWorld::PLANE ? false : is_static,
@@ -713,6 +713,8 @@ void Engine::Object::render()
     }
     if (!valid)
         return;
+    if (m_display_list > 0)
+        glDeleteLists(m_display_list, 1);
     m_display_list = glGenLists(1);
     glNewList(m_display_list, GL_COMPILE);
     glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, m_color);
@@ -720,7 +722,39 @@ void Engine::Object::render()
     /* TODO: finish */
     switch (m_geom_type)
     {
-        case OdeWorld::CUBE:
+        case OdeWorld::CUBE: {
+                struct { float norm[3]; float verts[4][3]; } sides[] = {
+                    { {1, 0, 0},        /* right */
+                        { {1, -1, -1}, {1, 1, -1}, {1, 1, 1}, {1, -1, 1} } },
+                    { {-1, 0, 0},       /* left */
+                        { {-1, 1, -1}, {-1, -1, -1}, {-1, -1, 1}, {-1, 1, 1} } },
+                    { {0, 1, 0},        /* back */
+                        { {1, 1, -1}, {-1, 1, -1}, {-1, 1, 1}, {1, 1, 1} } },
+                    { {0, -1, 0},       /* front */
+                        { {-1, -1, -1}, {1, -1, -1}, {1, -1, 1}, {-1, -1, 1} } },
+                    { {0, 0, 1},        /* top */
+                        { {-1, -1, 1}, {1, -1, 1}, {1, 1, 1}, {-1, 1, 1} } },
+                    { {0, 0, -1},       /* bottom */
+                        { {1, -1, -1}, {-1, -1, -1}, {-1, 1, -1}, {1, 1, -1} } }
+                };
+                glBegin(GL_QUADS);
+                float width = (*m_args)[0];
+                float depth = (*m_args)[1];
+                float height = (*m_args)[2];
+                for (unsigned int s = 0;
+                        s < (sizeof(sides)/sizeof(sides[0]));
+                        s++)
+                {
+                    glNormal3fv(sides[s].norm);
+                    for (int v = 0; v < 4; v++)
+                    {
+                        glVertex3f(sides[s].verts[v][0] * width / 2.0,
+                                sides[s].verts[v][1] * depth / 2.0,
+                                sides[s].verts[v][2] * height / 2.0);
+                    }
+                }
+                glEnd();
+            }
             break;
         case OdeWorld::SPHERE:
             gluSphere(quad, (*m_args)[0], 16, 8);