diff --git a/src/geometry/entity.rs b/src/geometry/entity.rs
index d91b0bf..39eebcd 100644
--- a/src/geometry/entity.rs
+++ b/src/geometry/entity.rs
@@ -16,6 +16,10 @@ impl<T> Default for EntityId<T> {
 impl<T> nohash_hasher::IsEnabled for EntityId<T> {}
 
 impl<T> EntityId<T> {
+    pub fn id(&self) -> u32 {
+        self.0
+    }
+
     fn take_next(&mut self) -> Self {
         let id = *self;
         self.0 += 1;
diff --git a/src/main.rs b/src/main.rs
index a4185df..8b0632a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,7 +3,7 @@ use eframe::{
     emath::{Pos2, Rect, RectTransform, Vec2},
     epaint::{color::Hsva, Color32, Stroke},
 };
-use geometry::{LineEntity, PointId, PointPos, SketchEntities};
+use geometry::{LineEntity, LineId, PointId, PointPos, SketchEntities};
 
 mod geometry;
 mod optimization;
@@ -37,6 +37,8 @@ struct ViewState {
     tool: Tool,
     hover_point: Option<PointId>,
     select_point: Option<PointId>,
+    hover_line: Option<LineId>,
+    select_line: Option<LineId>,
     drag_delta: Vec2,
 }
 
@@ -102,9 +104,8 @@ impl MyApp {
 
         let transform_pos = |pos: &PointPos| to_screen * Pos2::new(pos.x as f32, pos.y as f32);
 
-        let mut hover_line = None;
-
         state.hover_point = None;
+        state.hover_line = None;
 
         if let Some(hover_pos) = response.hover_pos() {
             for (id, point) in self
@@ -133,7 +134,7 @@ impl MyApp {
                 let hovered = ((0.)..=(1.)).contains(&p) && perp.length() < 5.0;
 
                 if hovered {
-                    hover_line = Some(id);
+                    state.hover_line = Some(id);
                     break;
                 }
             }
@@ -168,7 +169,13 @@ impl MyApp {
             match state.tool {
                 Tool::Select => {
                     if response.clicked() {
-                        state.select_point = state.hover_point;
+                        state.select_point = None;
+                        state.select_line = None;
+                        if state.hover_point.is_some() {
+                            state.select_point = state.hover_point;
+                        } else if state.hover_line.is_some() {
+                            state.select_line = state.hover_line;
+                        }
                     }
                 }
                 Tool::Move => {
@@ -240,7 +247,7 @@ impl MyApp {
             color.v -= 0.6;
             if state.hover_point.is_none()
                 && (state.select_point.is_none() || state.tool != Tool::Move)
-                && Some(id) == hover_line
+                && (Some(id) == state.hover_line || Some(id) == state.select_line)
             {
                 color.s -= 0.8;
             }
@@ -266,6 +273,23 @@ impl MyApp {
             painter.circle(center, POINT_RADIUS, color, stroke);
         }
     }
+
+    fn show_side_panel(&mut self, ui: &mut Ui) {
+        ui.vertical(|ui| match self.state.tool {
+            Tool::Select => {
+                if let Some(point_id) = self.state.select_point {
+                    ui.label(format!("Selected point {}", point_id.id()));
+                } else if let Some(line_id) = self.state.select_line {
+                    ui.label(format!("Selected line {}", line_id.id()));
+                } else {
+                    ui.label("No selection");
+                }
+            }
+            _ => {
+                ui.label(":)");
+            }
+        });
+    }
 }
 
 impl eframe::App for MyApp {
@@ -285,14 +309,7 @@ impl eframe::App for MyApp {
             .resizable(true)
             .default_width(150.0)
             .width_range(80.0..=200.0)
-            .show(ctx, |ui| {
-                ui.vertical_centered(|ui| {
-                    ui.heading("Left Panel");
-                });
-                // egui::ScrollArea::vertical().show(ui, |ui| {
-                //     lorem_ipsum(ui);
-                // });
-            });
+            .show(ctx, |ui| self.show_side_panel(ui));
 
         egui::TopBottomPanel::bottom("bottom_panel").show(ctx, |ui| {
             ui.horizontal(|ui| {