diff --git a/src/block.rs b/src/block.rs
index 59ef69a..0a2e2ed 100644
--- a/src/block.rs
+++ b/src/block.rs
@@ -1,38 +1,45 @@
 use action::Action;
-use std::vec;
+use structure::Structure;
 
-fn make_connections() -> Vec<f64> {
-    vec![0 as f64;9]
+pub enum Blocks {
+    Neuron,
+    Leg { dir: i32 }
 }
 
-trait Block {
-    fn get_connections(&self) -> &Vec<f64>;
-    fn get_value(&self) -> &f64;
-    fn get_name(&self) -> &'static str; 
-    fn compute(&mut self) -> Vec<Action>;
-    fn clean(&mut self);
-}
-
-struct NeuronBlock {
+pub struct Block {
+    structure: Structure,
     connections: Vec<f64>,
     current_value: f64,
     new_value: f64,
+    block_type: Blocks
 }
 
-impl Block for NeuronBlock {
-    fn get_connections(&self) -> &Vec<f64> {
+impl Block {
+    pub fn new(structure: Structure, btype: Blocks) -> Block {
+        Block {
+            structure: structure,
+            connections: vec![0 as f64;9],
+            current_value: 0 as f64,
+            new_value: 0 as f64,
+            block_type: btype
+        }
+    }
+    pub fn get_connections(&self) -> &Vec<f64> {
         &self.connections
     }
-    fn get_value(&self) -> &f64 {
+    pub fn get_value(&self) -> &f64 {
         &self.current_value
     }
-    fn get_name(&self) -> &'static str {
-        "Neuron"
+    pub fn get_name(&self) -> &'static str {
+        match self.block_type {
+            Blocks::Neuron => "Neuron",
+            Blocks::Leg { dir } => "Leg"
+        }
     }
-    fn compute(&mut self) -> Vec<Action> {
-        Vec::new()
+    pub fn clean(&mut self) {
+        self.current_value = self.new_value;
     }
-    fn clean(&mut self) {
-        self.current_value = self.new_value
+    pub fn compute(&mut self) -> Option<Vec<Action>> {
+        None
     }
 }
diff --git a/src/main.rs b/src/main.rs
index e6c9519..c72eff6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 mod util;
 mod action;
 mod block;
+mod structure;
 
 fn main() {
     println!("Hello, world!");
diff --git a/src/structure.rs b/src/structure.rs
index e69de29..889ee60 100644
--- a/src/structure.rs
+++ b/src/structure.rs
@@ -0,0 +1,27 @@
+use util::Point;
+use action::Action;
+use block::Block;
+
+pub struct Structure {
+    pub blocks: Vec<Block>,
+    pub position: Point
+}
+
+impl Structure {
+    fn compute(&mut self) -> Vec<Action> {
+        let mut v = Vec::new() as Vec<Action>;
+        // Iterate blocks
+        for b in &mut self.blocks {
+            // Compute and save result
+            let ret = match b.compute() {
+                Some(x) => x,
+                None => Vec::new() as Vec<Action>
+            };
+            // push actions to the structure's array
+            for i in ret {
+                v.push(i)
+            }
+        }
+        v
+    }
+}