diff --git a/dot/README.md b/dot/README.md
new file mode 100644
index 0000000..c8e53cc
--- /dev/null
+++ b/dot/README.md
@@ -0,0 +1,2 @@
+not sure what this is, I think I was trying to figure out what a dot product
+is
diff --git a/dot/dot.pde b/dot/dot.pde
new file mode 100644
index 0000000..a807e31
--- /dev/null
+++ b/dot/dot.pde
@@ -0,0 +1,39 @@
+PVector p1;
+PVector p2;
+PVector origin;
+
+void setup() {
+  size(500, 500);
+  background(255);
+  origin = new PVector(width * 0.5, height * 0.5);
+  p1 = new PVector(0, height * -0.25);
+  p2 = new PVector(width * 0.25, 0);
+}
+
+void draw() {
+  background(255);
+
+  translate(origin.x, origin.y);
+
+  strokeWeight(4);
+  stroke(255, 0, 0);
+  line(0, 0, p1.x, p1.y);
+  
+  stroke(0, 255, 0);
+  line(0, 0, p2.x, p2.y);
+
+  float p3 = PVector.dot(p1, p2);
+  fill(0);
+  textAlign(CENTER);
+  text(p3, 0, height * 0.25);
+}
+
+void mouseClicked() {
+  p2.x = mouseX - origin.x;
+  p2.y = mouseY - origin.y;
+}
+
+void mouseDragged() {
+  p2.x = mouseX - origin.x;
+  p2.y = mouseY - origin.y;  
+}
\ No newline at end of file