diff --git a/examples/managing_grid.rs b/examples/managing_grid.rs
index f4555dc..fa6d496 100644
--- a/examples/managing_grid.rs
+++ b/examples/managing_grid.rs
@@ -55,9 +55,9 @@ fn main() {
 
     let mut grid = GridEngine::new(10, 12);
 
-    grid.events_mut().add_changes_listener(Box::new(|event| {
+    grid.events_mut().add_changes_listener(|event| {
         println!("Event triggered: {:#?}", event);
-    }));
+    });
 
     grid.add_item("a".to_string(), 2, 2, 2, 4).unwrap();
     print_grid(&grid);
diff --git a/src/grid_engine.rs b/src/grid_engine.rs
index 5e26aa0..131302a 100644
--- a/src/grid_engine.rs
+++ b/src/grid_engine.rs
@@ -206,8 +206,8 @@ impl GridEngine {
     }
 
     /// Creates a new node with the specified parameters.
-    fn new_node(&mut self, id: String, x: usize, y: usize, w: usize, h: usize) -> Node {
-        Node::new(id, x, y, w, h)
+    fn new_node(&mut self, id: impl Into<String>, x: usize, y: usize, w: usize, h: usize) -> Node {
+        Node::new(id.into(), x, y, w, h)
     }
 
     /// Creates a change operation to add a new node to the grid.
@@ -216,7 +216,7 @@ impl GridEngine {
             .push(Change::Add(AddChangeData { value: node }));
     }
 
-    /// Get the nodes sorted by id
+    /// Get the node sorted by id
     ///
     /// # Example
     ///
@@ -235,8 +235,8 @@ impl GridEngine {
     /// # Ok(())
     /// # }
     /// ```
-    pub fn get_nodes(&self) -> Vec<Node> {
-        let mut cloned: Vec<Node> = self.items.values().cloned().collect();
+    pub fn get_nodes(&self) -> Vec<&Node> {
+        let mut cloned: Vec<&Node> = self.items.values().collect();
         // Would be better to sort by some created_at
         cloned.sort_by_key(|n| n.id.clone());
         cloned
@@ -307,16 +307,15 @@ impl GridEngine {
     /// ```
     pub fn add_item(
         &mut self,
-        id: String,
+        id: impl Into<String>,
         x: usize,
         y: usize,
         w: usize,
         h: usize,
     ) -> Result<&Node, GridEngineError> {
+        let id = id.into();
         if self.items.contains_key(&id) {
-            return Err(GridEngineError::Item(ItemError::ItemAlreadyExists {
-                id: id.clone(),
-            }));
+            return Err(GridEngineError::Item(ItemError::ItemAlreadyExists { id }));
         };
 
         let node = self.new_node(id, x, y, w, h);
diff --git a/src/grid_events.rs b/src/grid_events.rs
index a48b09f..14ea762 100644
--- a/src/grid_events.rs
+++ b/src/grid_events.rs
@@ -32,9 +32,9 @@
 //! let mut grid = GridEngine::new(10, 10);
 //!
 //! // Add a listener to track changes
-//! grid.events_mut().add_changes_listener(Box::new(|event| {
+//! grid.events_mut().add_changes_listener(|event| {
 //!     println!("Grid changed: {:?}", event.changes());
-//! }));
+//! });
 //!
 //! // Make changes to the grid
 //! grid.add_item("box1".to_string(), 0, 0, 2, 2).unwrap();
@@ -94,8 +94,11 @@ impl ListenerFunction {
     ///
     /// * `id` - Unique identifier for the listener
     /// * `function` - The callback function to execute when changes occur
-    pub fn new(id: String, function: ChangesEventFn) -> Self {
-        Self { id, function }
+    pub fn new(id: impl Into<String>, function: ChangesEventFn) -> Self {
+        Self {
+            id: id.into(),
+            function,
+        }
     }
 }
 
@@ -139,13 +142,16 @@ impl GridEvents {
     /// use grid_engine::grid_engine::GridEngine;
     ///
     /// let mut grid = GridEngine::new(10, 10);
-    /// let listener_id = grid.events_mut().add_changes_listener(Box::new(|event| {
+    /// let listener_id = grid.events_mut().add_changes_listener(|event| {
     ///     println!("Changes occurred: {:?}", event.changes());
-    /// }));
+    /// });
     /// ```
-    pub fn add_changes_listener(&mut self, function: ChangesEventFn) -> String {
+    pub fn add_changes_listener(
+        &mut self,
+        function: impl Fn(&ChangesEventValue) + Send + 'static + Sync,
+    ) -> String {
         let id = uuid::Uuid::new_v4().to_string();
-        let listener = ListenerFunction::new(id.clone(), function);
+        let listener = ListenerFunction::new(id.clone(), Box::new(function));
 
         self.changes_listeners.push(listener);
         id
@@ -163,7 +169,7 @@ impl GridEvents {
     /// use grid_engine::grid_engine::GridEngine;
     ///
     /// let mut grid = GridEngine::new(10, 10);
-    /// let listener_id = grid.events_mut().add_changes_listener(Box::new(|_| {}));
+    /// let listener_id = grid.events_mut().add_changes_listener(|_| {});
     /// let removed = grid.events_mut().remove_changes_listener(&listener_id); // Listener removed
     ///
     /// assert!(removed.is_some());
@@ -206,7 +212,7 @@ mod tests {
     #[test]
     fn test_add_changes_listener() {
         let mut events = GridEvents::default();
-        let listener_id = events.add_changes_listener(Box::new(|_| {}));
+        let listener_id = events.add_changes_listener(|_| {});
 
         assert_eq!(events.changes_listeners.len(), 1);
         assert!(!listener_id.is_empty());
@@ -215,7 +221,7 @@ mod tests {
     #[test]
     fn test_remove_changes_listener() {
         let mut events = GridEvents::default();
-        let listener_id = events.add_changes_listener(Box::new(|_| {}));
+        let listener_id = events.add_changes_listener(|_| {});
 
         events.remove_changes_listener(&listener_id);
         assert_eq!(events.changes_listeners.len(), 0);
@@ -224,8 +230,8 @@ mod tests {
     #[test]
     fn test_multiple_listeners() {
         let mut events = GridEvents::default();
-        let _id1 = events.add_changes_listener(Box::new(|_| {}));
-        let _id2 = events.add_changes_listener(Box::new(|_| {}));
+        let _id1 = events.add_changes_listener(|_| {});
+        let _id2 = events.add_changes_listener(|_| {});
 
         assert_eq!(events.changes_listeners.len(), 2);
     }
@@ -236,10 +242,10 @@ mod tests {
         let counter = Arc::new(Mutex::new(0));
         let counter_clone = counter.clone();
 
-        events.add_changes_listener(Box::new(move |_| {
+        events.add_changes_listener(move |_| {
             let mut count = counter_clone.lock().unwrap();
             *count += 1;
-        }));
+        });
 
         let changes = ChangesEventValue { changes: vec![] };
         events.trigger_changes_event(&changes);
@@ -255,10 +261,10 @@ mod tests {
         // Add two listeners that increment the same counter
         for _ in 0..2 {
             let counter_clone = counter.clone();
-            events.add_changes_listener(Box::new(move |_| {
+            events.add_changes_listener(move |_| {
                 let mut count = counter_clone.lock().unwrap();
                 *count += 1;
-            }));
+            });
         }
 
         let changes = ChangesEventValue { changes: vec![] };
@@ -273,10 +279,10 @@ mod tests {
         let received_changes = Arc::new(Mutex::new(Vec::new()));
         let received_changes_clone = received_changes.clone();
 
-        events.add_changes_listener(Box::new(move |event| {
+        events.add_changes_listener(move |event| {
             let mut changes = received_changes_clone.lock().unwrap();
             changes.extend(event.changes.clone());
-        }));
+        });
 
         // Create a mock change
         let node = crate::node::Node::new("test".to_string(), 0, 0, 1, 1);
diff --git a/src/inner_grid.rs b/src/inner_grid.rs
index 4840d94..e2ba6c9 100644
--- a/src/inner_grid.rs
+++ b/src/inner_grid.rs
@@ -137,7 +137,7 @@ impl InnerGrid {
         self.inner.get(y, x)
     }
 
-    pub(crate) fn get_mut(&mut self, x: usize, y: usize) -> Option<&mut Option<String>> {
+    pub fn get_mut(&mut self, x: usize, y: usize) -> Option<&mut Option<String>> {
         if self.inner.get(y, x).is_none() {
             self.handle_expansion(x, y);
         }
@@ -161,7 +161,7 @@ impl InnerGrid {
     ///
     /// * `Ok(())` - If the update was successful
     /// * `Err(InnerGridError)` - If the coordinates are invalid
-    pub(crate) fn update(
+    pub fn update(
         &mut self,
         node: &Node,
         x: usize,
diff --git a/src/lib.rs b/src/lib.rs
index 40631e3..8f26f1e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -48,7 +48,7 @@
 //!
 //! See the `examples` directory for more usage examples.
 
-mod error;
+pub mod error;
 pub mod grid_engine;
 mod grid_events;
 mod inner_grid;
diff --git a/src/node.rs b/src/node.rs
index 1c66bce..336e14b 100644
--- a/src/node.rs
+++ b/src/node.rs
@@ -42,15 +42,15 @@ use crate::{
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub struct Node {
     /// Unique identifier for the node
-    pub(crate) id: String,
+    pub id: String,
     /// X coordinate of the top-left corner
-    pub(crate) x: usize,
+    pub x: usize,
     /// Y coordinate of the top-left corner
-    pub(crate) y: usize,
+    pub y: usize,
     /// Width of the node in grid cells
-    pub(crate) w: usize,
+    pub w: usize,
     /// Height of the node in grid cells
-    pub(crate) h: usize,
+    pub h: usize,
 }
 
 impl Node {
@@ -63,8 +63,14 @@ impl Node {
     /// * `y` - Y coordinate of the top-left corner
     /// * `w` - Width in grid cells
     /// * `h` - Height in grid cells
-    pub(crate) fn new(id: String, x: usize, y: usize, w: usize, h: usize) -> Node {
-        Node { id, x, y, w, h }
+    pub fn new(id: impl Into<String>, x: usize, y: usize, w: usize, h: usize) -> Node {
+        Node {
+            id: id.into(),
+            x,
+            y,
+            w,
+            h,
+        }
     }
 
     /// Iterates over all cells occupied by this node.
diff --git a/src/utils.rs b/src/utils.rs
index 5e2d81d..b46e0ee 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -61,7 +61,7 @@ pub struct ForCellArgs {
 ///
 /// If the callback returns an error for any cell, iteration stops immediately
 /// and the error is propagated to the caller.
-pub(crate) fn for_cell(
+pub fn for_cell(
     args: ForCellArgs,
     callback: &mut impl FnMut(usize, usize) -> Result<(), InnerGridError>,
 ) -> Result<(), InnerGridError> {