diff --git a/day3/sketch_creature_attractor/CircleCreature.pde b/day3/sketch_creature_attractor/CircleCreature.pde
new file mode 100644
index 0000000..6e3f141
--- /dev/null
+++ b/day3/sketch_creature_attractor/CircleCreature.pde
@@ -0,0 +1,18 @@
+class CircleCreature extends Creature {
+  
+  public CircleCreature(int x, int y, int r) {
+    super(x, y, r);
+    ellipseMode(RADIUS);
+  }  
+  
+  public void draw_shape(){
+    ellipse(0, 0, radius(), radius());  
+    line(0, 0, radius(), 0);
+  }
+  
+  public boolean inside(int mx, int my) {    
+    if(dist(mx, my, position().x, position().y) < radius()) return true;
+    return false;
+  }
+  
+};
diff --git a/day3/sketch_creature_attractor/Creature.pde b/day3/sketch_creature_attractor/Creature.pde
new file mode 100644
index 0000000..7f35285
--- /dev/null
+++ b/day3/sketch_creature_attractor/Creature.pde
@@ -0,0 +1,37 @@
+import teilchen.BehaviorParticle;
+import mathematik.Vector3f;
+
+class Creature extends BehaviorParticle {
+  
+  float   _scale;
+  
+  public Creature(int x, int y, int r) {
+    super();
+    position().set(x, y);
+    maximumInnerForce(100);
+    radius(r);
+    _scale = 1.0;
+  }
+  
+  public void display() {
+    pushMatrix();
+    translate(position().x, position().y);
+    rotate(getRotation()); 
+    scale(_scale);
+    draw_shape();
+    popMatrix();
+    
+  }
+  
+  private float getRotation() {
+    if(velocity().isNaN() || velocity().magnitude() == 0) return 0;
+    Vector3f v = new Vector3f(-1, 0, 0);    
+    return velocity().angle(v);
+  }
+  
+  public void draw_shape() {}
+  
+  public boolean inside(int mx, int my){return false;}
+  
+};
+
diff --git a/day3/sketch_creature_attractor/SquareCreature.pde b/day3/sketch_creature_attractor/SquareCreature.pde
new file mode 100644
index 0000000..c218805
--- /dev/null
+++ b/day3/sketch_creature_attractor/SquareCreature.pde
@@ -0,0 +1,22 @@
+class SquareCreature extends Creature {
+  
+  int _width;
+  int _height;
+  
+  public SquareCreature(int x, int y, int w, int h) {
+    super(x, y, (int)sqrt(pow(w / 2, 2) + pow(h / 2, 2)));
+    _width = w;
+    _height = h;    
+    rectMode(CENTER);
+  }  
+  
+  public void draw_shape(){
+    rect(0, 0, _width, _height);  
+  }
+  
+  public boolean inside(int mx, int my) {    
+    if(dist(mx, my, position().x, position().y) < radius()) return true;
+    return false;
+  }
+  
+};
diff --git a/day3/sketch_creature_attractor/TriangleCreature.pde b/day3/sketch_creature_attractor/TriangleCreature.pde
new file mode 100644
index 0000000..fc4e50b
--- /dev/null
+++ b/day3/sketch_creature_attractor/TriangleCreature.pde
@@ -0,0 +1,36 @@
+class TriangleCreature extends Creature {
+  
+  PVector A, B, C;
+  
+  public TriangleCreature(int x, int y, int r) {
+    super(x, y, r);
+    
+    A = new PVector();
+    B = new PVector();
+    C = new PVector();
+    
+    float theta = TWO_PI/3;
+    
+    A.x = cos(0 * theta) * r;
+    A.y = sin(0 * theta) * r;
+    
+    B.x = cos(1 * theta) * r;
+    B.y = sin(1 * theta) * r;
+    
+    C.x = cos(2 * theta) * r;
+    C.y = sin(2 * theta) * r;
+    
+  }  
+  
+  public void draw_shape(){
+    triangle(A.x, A.y, B.x, B.y, C.x, C.y);  
+    line(0, 0, A.x, 0);
+  }
+  
+  public boolean inside(int mx, int my) {    
+    if(dist(mx, my, position().x, position().y) < radius()) return true;
+    return false;
+  }
+
+    
+};
diff --git a/day3/sketch_creature_attractor/sketch.properties b/day3/sketch_creature_attractor/sketch.properties
new file mode 100644
index 0000000..8630fa2
--- /dev/null
+++ b/day3/sketch_creature_attractor/sketch.properties
@@ -0,0 +1,2 @@
+mode.id=processing.mode.java.JavaMode
+mode=Java
diff --git a/day3/sketch_creature_attractor/sketch_creature_attractor.pde b/day3/sketch_creature_attractor/sketch_creature_attractor.pde
new file mode 100644
index 0000000..2de54f5
--- /dev/null
+++ b/day3/sketch_creature_attractor/sketch_creature_attractor.pde
@@ -0,0 +1,81 @@
+import teilchen.Physics;
+import teilchen.force.Attractor;
+import teilchen.force.ViscousDrag;
+
+final int CANVAS_WIDTH = 500;
+final int CANVAS_HEIGHT = 500;
+
+final int NBR_CREATURES = 75;
+
+Physics physics;
+Attractor attractor;
+
+ArrayList<Creature> creatures = new ArrayList<Creature>();
+
+void setup() {  
+  size(CANVAS_WIDTH, CANVAS_HEIGHT);
+  background(23, 68, 250);
+  frameRate(30);
+  
+  physics = new Physics();
+  
+  // create a global drag
+  ViscousDrag drag = new ViscousDrag();
+  drag.coefficient = 0.75f;
+  physics.add(drag);  
+  
+  // create attaractor
+  attractor = new Attractor();
+  attractor.radius(50);
+  attractor.strength(200);
+  physics.add(attractor);
+  
+  // create all creatures
+  Creature c;
+  for(int i = 0; i < NBR_CREATURES; i++) {
+    if(i % 3 == 0) {
+      c = new CircleCreature((int)random(width), (int)random(height), 20);
+    } else if(i % 3 == 1) {
+      c = new TriangleCreature((int)random(width), (int)random(height), 20);
+    } else {
+      c = new SquareCreature((int)random(width), (int)random(height), 30, 30);
+    }
+    creatures.add(c);
+    physics.add(c);  
+  }
+  
+}
+
+void draw() {
+  
+  attractor.position().set(mouseX, mouseY);
+  
+  physics.step(1.0 / frameRate);
+ 
+  background(23, 68, 250);
+  stroke(255);
+  noFill();
+  
+  for(int i = 0; i < creatures.size(); i++) {
+    Creature c = creatures.get(i);
+    c.display();
+  }    
+  
+  if(attractor.strength() < 0) {
+    stroke(255, 0, 0);
+    fill(255, 0, 0, 35);
+  } else {
+    stroke(0, 255, 0);
+    fill(0, 255, 0, 35);    
+  }
+  
+  ellipse(attractor.position().x, attractor.position().y,
+  attractor.radius(), attractor.radius());
+
+}
+
+void mousePressed() {
+  float inv = -1 * attractor.strength();
+  attractor.strength(inv);    
+}
+
diff --git a/day3/sketch_creature_spring/CircleCreature.pde b/day3/sketch_creature_spring/CircleCreature.pde
new file mode 100644
index 0000000..6e3f141
--- /dev/null
+++ b/day3/sketch_creature_spring/CircleCreature.pde
@@ -0,0 +1,18 @@
+class CircleCreature extends Creature {
+  
+  public CircleCreature(int x, int y, int r) {
+    super(x, y, r);
+    ellipseMode(RADIUS);
+  }  
+  
+  public void draw_shape(){
+    ellipse(0, 0, radius(), radius());  
+    line(0, 0, radius(), 0);
+  }
+  
+  public boolean inside(int mx, int my) {    
+    if(dist(mx, my, position().x, position().y) < radius()) return true;
+    return false;
+  }
+  
+};
diff --git a/day3/sketch_creature_spring/Creature.pde b/day3/sketch_creature_spring/Creature.pde
new file mode 100644
index 0000000..7f35285
--- /dev/null
+++ b/day3/sketch_creature_spring/Creature.pde
@@ -0,0 +1,37 @@
+import teilchen.BehaviorParticle;
+import mathematik.Vector3f;
+
+class Creature extends BehaviorParticle {
+  
+  float   _scale;
+  
+  public Creature(int x, int y, int r) {
+    super();
+    position().set(x, y);
+    maximumInnerForce(100);
+    radius(r);
+    _scale = 1.0;
+  }
+  
+  public void display() {
+    pushMatrix();
+    translate(position().x, position().y);
+    rotate(getRotation()); 
+    scale(_scale);
+    draw_shape();
+    popMatrix();
+    
+  }
+  
+  private float getRotation() {
+    if(velocity().isNaN() || velocity().magnitude() == 0) return 0;
+    Vector3f v = new Vector3f(-1, 0, 0);    
+    return velocity().angle(v);
+  }
+  
+  public void draw_shape() {}
+  
+  public boolean inside(int mx, int my){return false;}
+  
+};
+
diff --git a/day3/sketch_creature_spring/SquareCreature.pde b/day3/sketch_creature_spring/SquareCreature.pde
new file mode 100644
index 0000000..c218805
--- /dev/null
+++ b/day3/sketch_creature_spring/SquareCreature.pde
@@ -0,0 +1,22 @@
+class SquareCreature extends Creature {
+  
+  int _width;
+  int _height;
+  
+  public SquareCreature(int x, int y, int w, int h) {
+    super(x, y, (int)sqrt(pow(w / 2, 2) + pow(h / 2, 2)));
+    _width = w;
+    _height = h;    
+    rectMode(CENTER);
+  }  
+  
+  public void draw_shape(){
+    rect(0, 0, _width, _height);  
+  }
+  
+  public boolean inside(int mx, int my) {    
+    if(dist(mx, my, position().x, position().y) < radius()) return true;
+    return false;
+  }
+  
+};
diff --git a/day3/sketch_creature_spring/TriangleCreature.pde b/day3/sketch_creature_spring/TriangleCreature.pde
new file mode 100644
index 0000000..fc4e50b
--- /dev/null
+++ b/day3/sketch_creature_spring/TriangleCreature.pde
@@ -0,0 +1,36 @@
+class TriangleCreature extends Creature {
+  
+  PVector A, B, C;
+  
+  public TriangleCreature(int x, int y, int r) {
+    super(x, y, r);
+    
+    A = new PVector();
+    B = new PVector();
+    C = new PVector();
+    
+    float theta = TWO_PI/3;
+    
+    A.x = cos(0 * theta) * r;
+    A.y = sin(0 * theta) * r;
+    
+    B.x = cos(1 * theta) * r;
+    B.y = sin(1 * theta) * r;
+    
+    C.x = cos(2 * theta) * r;
+    C.y = sin(2 * theta) * r;
+    
+  }  
+  
+  public void draw_shape(){
+    triangle(A.x, A.y, B.x, B.y, C.x, C.y);  
+    line(0, 0, A.x, 0);
+  }
+  
+  public boolean inside(int mx, int my) {    
+    if(dist(mx, my, position().x, position().y) < radius()) return true;
+    return false;
+  }
+
+    
+};
diff --git a/day3/sketch_creature_spring/sketch.properties b/day3/sketch_creature_spring/sketch.properties
new file mode 100644
index 0000000..8630fa2
--- /dev/null
+++ b/day3/sketch_creature_spring/sketch.properties
@@ -0,0 +1,2 @@
+mode.id=processing.mode.java.JavaMode
+mode=Java
diff --git a/day3/sketch_creature_spring/sketch_creature_spring.pde b/day3/sketch_creature_spring/sketch_creature_spring.pde
new file mode 100644
index 0000000..22fedea
--- /dev/null
+++ b/day3/sketch_creature_spring/sketch_creature_spring.pde
@@ -0,0 +1,59 @@
+import teilchen.Physics;
+import teilchen.force.Spring;
+import teilchen.force.ViscousDrag;
+
+final int CANVAS_WIDTH = 500;
+final int CANVAS_HEIGHT = 500;
+
+final int NBR_CREATURES = 75;
+
+Physics physics;
+Spring spring;
+
+Creature t;
+Creature c;
+
+ArrayList<Creature> creatures = new ArrayList<Creature>();
+
+void setup() {  
+  size(CANVAS_WIDTH, CANVAS_HEIGHT);
+  background(23, 68, 250);
+  frameRate(30);
+  
+  physics = new Physics();
+  
+  // create a global drag
+  ViscousDrag drag = new ViscousDrag();
+  drag.coefficient = 0.25f;
+  physics.add(drag);  
+  
+  t = new TriangleCreature((int)random(width), (int)random(height), 20);
+  c = new CircleCreature((int)random(width), (int)random(height), 20);
+  
+  physics.add(t); physics.add(c);
+  
+  spring = physics.makeSpring(t, c);
+  spring.restlength(20);
+  
+}
+
+void draw() {
+  
+  physics.step(1.0 / frameRate);
+ 
+  background(23, 68, 250);
+  stroke(255);
+  noFill();
+  
+  c.display();
+  t.display();
+  
+  stroke(255, 0, 0);
+  line(c.position().x, c.position().y, t.position().x, t.position().y);
+
+}
+
+void mouseDragged() {
+  spring.b().position().set(mouseX, mouseY);
+}
+