diff --git a/app-proto/inversive-display/src/inversive.frag b/app-proto/inversive-display/src/inversive.frag
index 2fcd86e..9913b40 100644
--- a/app-proto/inversive-display/src/inversive.frag
+++ b/app-proto/inversive-display/src/inversive.frag
@@ -46,6 +46,7 @@ uniform bool debug_mode;
 const float focal_slope = 0.3;
 const vec3 light_dir = normalize(vec3(2., 2., 1.));
 const float ixn_threshold = 0.005;
+const float INTERIOR_DIMMING = 0.7;
 
 // --- sRGB ---
 
@@ -143,6 +144,7 @@ void main() {
         vec2 hit_depths = sphere_cast(sphere_list[id], dir);
         
         // insertion-sort the fragments we hit into the fragment list
+        float dimming = 1.;
         for (int side = 0; side < 2; ++side) {
             float hit_z = -hit_depths[side];
             if (0. > hit_z) {
@@ -154,7 +156,7 @@ void main() {
                             frags[layer] = sphere_shading(
                                 sphere_list[id],
                                 hit_depths[side] * dir,
-                                color_list[id],
+                                dimming * color_list[id],
                                 id
                             );
                         }
@@ -167,6 +169,7 @@ void main() {
                     }
                 }
                 layer_cnt = min(layer_cnt + 1, LAYER_MAX);
+                dimming = INTERIOR_DIMMING;
             }
         }
     }