diff --git a/crates/topola-egui/src/displayer.rs b/crates/topola-egui/src/displayer.rs
index 87cd9cc..2de8292 100644
--- a/crates/topola-egui/src/displayer.rs
+++ b/crates/topola-egui/src/displayer.rs
@@ -570,11 +570,22 @@ impl<'a> Displayer<'a> {
                     .shape()
                     .center();
 
+                let color = if let Some(activity) = &mut self.workspace.interactor.maybe_activity()
+                {
+                    if activity.obstacles().contains(&primitive) {
+                        egui::Color32::from_rgb(255, 255, 255)
+                    } else {
+                        egui::Color32::from_rgb(150, 150, 150)
+                    }
+                } else {
+                    egui::Color32::from_rgb(255, 255, 255)
+                };
+
                 self.painter.paint_text(
                     pos,
                     egui::Align2::CENTER_CENTER,
                     &format!("{}", primitive.index()),
-                    egui::Color32::from_rgb(200, 200, 200),
+                    color,
                 );
             }
         }
diff --git a/locales/en-US/main.ftl b/locales/en-US/main.ftl
index 2dc2c62..6b628aa 100644
--- a/locales/en-US/main.ftl
+++ b/locales/en-US/main.ftl
@@ -56,8 +56,9 @@ tr-menu-route-options-presort-by-pairwise-detours = Pairwise Detours
 
 tr-menu-route-options-permutate = Permutate
 
-## Continuously applied, so use imperfective aspect if possible, e.g. in Polish
-## it should be "przeciskaj pod taśmami" instead of "przeciśnij pod taśmami".
+## Continuously applied, so use frequentative or imperfective aspect
+## if possible, e.g. in Polish it should be "przeciskaj pod taśmami"
+## (frequentative) instead of "przeciśnij pod taśmami".
 
 tr-menu-route-options-squeeze-through-under-bends = Squeeze through under Bends
 tr-menu-route-options-wrap-around-bands = Wrap around Bands