diff --git a/.gitignore b/.gitignore
index 281c03b..a005807 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,8 +3,11 @@
 *.sln
 *.vcx*
 *.workspace*
+addons.make
 config.make
 Makefile
+
+*.vscode
 *.xcodeproj
 *.plist
 *.xcconfig
@@ -27,6 +30,7 @@ project.xcworkspace
 
 .svn/
 obj/
-bin/
+bin/**
+!bin/data
 build/
-!data/
\ No newline at end of file
+!data/
diff --git a/chp0-intro-01-randomwalk-traditional/README.md b/chp0-intro-01-randomwalk-traditional/README.md
new file mode 100644
index 0000000..28e51fd
--- /dev/null
+++ b/chp0-intro-01-randomwalk-traditional/README.md
@@ -0,0 +1,5 @@
+# Example I.1: Traditional Random Walk
+
+![screenshot](./bin/data/screenshot-01.png)
+
+
diff --git a/chp0-intro-01-randomwalk-traditional/bin/data/screenshot-01.png b/chp0-intro-01-randomwalk-traditional/bin/data/screenshot-01.png
new file mode 100644
index 0000000..5491f45
Binary files /dev/null and b/chp0-intro-01-randomwalk-traditional/bin/data/screenshot-01.png differ
diff --git a/chp0-intro-01-randomwalk-traditional/src/main.cpp b/chp0-intro-01-randomwalk-traditional/src/main.cpp
index 6ca3557..3f4fdf0 100644
--- a/chp0-intro-01-randomwalk-traditional/src/main.cpp
+++ b/chp0-intro-01-randomwalk-traditional/src/main.cpp
@@ -3,7 +3,7 @@
 
 //========================================================================
 int main( ){
-	ofSetupOpenGL(800,200,OF_WINDOW);			// <-------- setup the GL context
+	ofSetupOpenGL(1024, 768, OF_WINDOW);			// <-------- setup the GL context
 
 	// this kicks off the running of my app
 	// can be OF_WINDOW or OF_FULLSCREEN
diff --git a/chp0-intro-01-randomwalk-traditional/src/ofApp.cpp b/chp0-intro-01-randomwalk-traditional/src/ofApp.cpp
index 2aced09..a67e55f 100644
--- a/chp0-intro-01-randomwalk-traditional/src/ofApp.cpp
+++ b/chp0-intro-01-randomwalk-traditional/src/ofApp.cpp
@@ -2,26 +2,26 @@
 
 //--------------------------------------------------------------
 void ofApp::setup(){
-    
-    ofBackground(255);
-    ofSetBackgroundAuto(false);
-    
-    w = walker();
+  ofSetBackgroundColor(m_backgroundColor);
+  ofSetBackgroundAuto(false);
+  ofSetCircleResolution(100);
+
+  auto position = glm::vec2 { ofGetWidth() / 2, ofGetHeight() / 2 };
+
+  m_walker.setup(position, 2);
 }
 
 //--------------------------------------------------------------
 void ofApp::update(){
-    
-    ofSetFrameRate(mouseX);
-    w.update();
+  m_walker.update();
 }
 
 //--------------------------------------------------------------
 void ofApp::draw(){
-    
-    ofTranslate(ofGetWidth()/2, ofGetHeight()/2);
-    ofScale(w.scale, w.scale);
-    w.draw();
+  ofFill();
+  ofSetColor(m_walkerColor);
+
+  m_walker.draw();
 }
 
 //--------------------------------------------------------------
diff --git a/chp0-intro-01-randomwalk-traditional/src/ofApp.h b/chp0-intro-01-randomwalk-traditional/src/ofApp.h
index 29f986f..09cf221 100644
--- a/chp0-intro-01-randomwalk-traditional/src/ofApp.h
+++ b/chp0-intro-01-randomwalk-traditional/src/ofApp.h
@@ -1,11 +1,17 @@
 #pragma once
 
 #include "ofMain.h"
-#include "walker.h"
+#include "Walker.h"
 
-class ofApp : public ofBaseApp{
+class ofApp : public ofBaseApp {
+  private:
+    ofColor m_backgroundColor { 40, 44, 52 };
+    ofColor m_walkerColor { 140, 132, 247 };
+
+    Walker m_walker;
+
+  public:
 
-public:
     void setup();
     void update();
     void draw();
@@ -19,6 +25,4 @@ class ofApp : public ofBaseApp{
     void windowResized(int w, int h);
     void dragEvent(ofDragInfo dragInfo);
     void gotMessage(ofMessage msg);
-
-    walker w;
 };
diff --git a/chp0-intro-01-randomwalk-traditional/src/walker.cpp b/chp0-intro-01-randomwalk-traditional/src/walker.cpp
index 5a61fc6..2599db2 100644
--- a/chp0-intro-01-randomwalk-traditional/src/walker.cpp
+++ b/chp0-intro-01-randomwalk-traditional/src/walker.cpp
@@ -1,36 +1,35 @@
+#include "Walker.h"
 
-#include "walker.h"
 
-walker::walker() {
-    x = 0;
-    y = 0;
-    scale = 5;
+void Walker::setup(const glm::vec2& position, int radius) {
+  m_position = position;
+  m_radius = radius;
 }
 
 
-void walker::update() {
-    int choice = int(ofRandom(4));
-    cout << choice << endl;
-    
-    if (choice == 0) x++;
-    else if (choice == 1) x--;
-    else if (choice == 2) y++;
-    else if (choice == 3) y--;
-    
-    int rangeWidth = (ofGetWidth()/2) /scale;
-    int rangeHeight = (ofGetHeight()/2) /scale;
-    
-    x = constrain(x, -rangeWidth, rangeWidth);
-    y = constrain(y, -rangeHeight, rangeHeight);
+void Walker::update() {
+  step();
+  keepInBounds();
 }
 
 
-void walker::draw() {
-    ofSetColor(0,20);
-    ofDrawRectangle(x, y, 1, 1);
+void Walker::draw() {
+  ofDrawCircle(m_position, m_radius);
 }
 
 
-int walker::constrain(int input, int min, int max) {
-    return (input < min) ? min : ((input > max) ? max : input);
-}
\ No newline at end of file
+void Walker::step() {
+  int choice = ofRandom(4);
+  cout << "New step choice: " << choice << "\n";
+
+  if (choice == 0) m_position.x += (m_radius * 2);
+  else if (choice == 1) m_position.x -= (m_radius * 2);
+  else if (choice == 2) m_position.y += (m_radius * 2);
+  else if (choice == 3) m_position.y -= (m_radius * 2);
+}
+
+
+void Walker::keepInBounds() {
+  m_position.x = ofClamp(m_position.x, 0.0, ofGetWidth());
+  m_position.y = ofClamp(m_position.y, 0.0, ofGetHeight());
+}
diff --git a/chp0-intro-01-randomwalk-traditional/src/walker.h b/chp0-intro-01-randomwalk-traditional/src/walker.h
index 9973c21..22cf3bc 100644
--- a/chp0-intro-01-randomwalk-traditional/src/walker.h
+++ b/chp0-intro-01-randomwalk-traditional/src/walker.h
@@ -1,17 +1,21 @@
 #pragma once
+
 #include "ofMain.h"
 
-class walker {
-public:
-    walker();
+class Walker {
+  private:
+    glm::vec2 m_position;
+    int m_radius;
+
+    void step();
+    void keepInBounds();
 
+  public:
+    void setup(const glm::vec2& position, int radius = 1);
     void update();
     void draw();
 
-    int constrain(int, int, int);
-
-    int x;
-    int y;
-    int scale;
+    const glm::vec2& getPosition() { return m_position; }
+    void setPosition(const glm::vec2& position) { m_position = position; }
 };