diff --git a/stylix/testbed/images.nix b/stylix/testbed/images.nix
index 03e1aafc..1b5bde79 100644
--- a/stylix/testbed/images.nix
+++ b/stylix/testbed/images.nix
@@ -1,5 +1,6 @@
 {
   fetchurl,
+  runCommandLocal,
 }:
 {
   dark = fetchurl {
@@ -8,11 +9,22 @@
     hash = "sha256-Dm/0nKiTFOzNtSiARnVg7zM0J1o+EuIdUQ3OAuasM58=";
   };
 
-  light = fetchurl {
-    # Includes a space to make sure the path is properly quoted via
-    # `lib.escapeShellArg` when used as a shell argument.
-    name = "three bicycles.jpg";
-    url = "https://unsplash.com/photos/hwLAI5lRhdM/download?ixid=M3wxMjA3fDB8MXxhbGx8fHx8fHx8fHwxNzE2MzYxNDcwfA&force=true";
-    hash = "sha256-S0MumuBGJulUekoGI2oZfUa/50Jw0ZzkqDDu1nRkFUA=";
-  };
+  light =
+    let
+      image = fetchurl {
+        name = "three-bicycles.jpg";
+        url = "https://unsplash.com/photos/hwLAI5lRhdM/download?ixid=M3wxMjA3fDB8MXxhbGx8fHx8fHx8fHwxNzE2MzYxNDcwfA&force=true";
+        hash = "sha256-S0MumuBGJulUekoGI2oZfUa/50Jw0ZzkqDDu1nRkFUA=";
+      };
+
+      # Create a path containing a space to test that `stylix.image` is
+      # correctly quoted when used as a shell argument. We have to use a
+      # directory as the parent because derivation names themselves cannot
+      # contain spaces.
+      directory = runCommandLocal "three-bicycles" { } ''
+        mkdir "$out"
+        cp ${image} "$out/three bicycles.jpg"
+      '';
+    in
+    "${directory}/three bicycles.jpg";
 }
diff --git a/stylix/testbed/themes/schemeless.nix b/stylix/testbed/themes/schemeless.nix
index f656f781..91c6789d 100644
--- a/stylix/testbed/themes/schemeless.nix
+++ b/stylix/testbed/themes/schemeless.nix
@@ -5,8 +5,8 @@ in
 {
   stylix = {
     enable = true;
-    image = images.dark;
-    polarity = "dark";
+    image = images.light;
+    polarity = "light";
     cursor = {
       name = "Vanilla-DMZ";
       package = pkgs.vanilla-dmz;