diff --git a/app-proto/inversive-display/src/inversive.frag b/app-proto/inversive-display/src/inversive.frag
index 93bdde4..dcc8610 100644
--- a/app-proto/inversive-display/src/inversive.frag
+++ b/app-proto/inversive-display/src/inversive.frag
@@ -121,7 +121,7 @@ vec2 sphere_cast(vecInv v, vec3 dir) {
 }
 
 void main() {
-    const int sphere_cnt = 2;
+    const int sphere_cnt = 3;
     
     vec2 scr = (2.*gl_FragCoord.xy - resolution) / shortdim;
     vec3 dir = vec3(focal_slope * scr, -1.);
@@ -130,9 +130,11 @@ void main() {
     vecInv sphere_list [sphere_cnt];
     sphere_list[0] = sphere(vec3(0.5, 0.5, -5. + ctrl.x), radius.x);
     sphere_list[1] = sphere(vec3(-0.5, -0.5, -5. + ctrl.y), radius.y);
+    sphere_list[2] = sphere(vec3(-0.5, 0.5, -5.), 0.75);
     vec3 color_list [sphere_cnt];
-    color_list[0] = vec3(1., 0.214, 0.);
-    color_list[1] = vec3(0., 0.214, 1.);
+    color_list[0] = vec3(1., 0.25, 0.);
+    color_list[1] = vec3(0., 0.25, 1.);
+    color_list[2] = vec3(0.25, 0., 1.0);
     
     // cast rays through the spheres
     vec2 depth_pairs [sphere_cnt];
diff --git a/app-proto/inversive-display/src/main.rs b/app-proto/inversive-display/src/main.rs
index 186facf..7bd2639 100644
--- a/app-proto/inversive-display/src/main.rs
+++ b/app-proto/inversive-display/src/main.rs
@@ -211,7 +211,7 @@ fn main() {
                 )
                 input(
                     type="range",
-                    max=3.0,
+                    max=5.0,
                     step=1.0,
                     bind:valueAsNumber=layer_threshold
                 )