diff --git a/algs4/src/go/algs4/canvas.go b/algs4/src/go/algs4/canvas.go
index f79d93f..48cfd33 100644
--- a/algs4/src/go/algs4/canvas.go
+++ b/algs4/src/go/algs4/canvas.go
@@ -86,7 +86,8 @@ func (me *Canvas) Rectangle(x, y, halfWidth, halfHeight float64) error {
 	hs := me.factorY(f2 * halfHeight)
 
 	if ws <= 1 && hs <= 1 {
-		return me.Pixel(x, y)
+		me.Pixel(x, y)
+		return nil
 	}
 
 	draw.Draw(me.img, image.Rect(int(xs-ws/f2), int(ys-hs/f2), int(ws), int(hs)),
@@ -95,8 +96,11 @@ func (me *Canvas) Rectangle(x, y, halfWidth, halfHeight float64) error {
 	return nil
 }
 
-func (me *Canvas) Pixel(x, y float64) error {
-	return nil
+func (me *Canvas) Pixel(x, y float64) {
+	originX, originY := int(me.scaleX(x)), int(me.scaleY(y))
+	draw.Draw(me.img, image.Rect(originX, originY, originX+1, originY+1),
+		&image.Uniform{image.White}, image.ZP, draw.Src)
+	me.window.FlushImage()
 }
 
 func (me *Canvas) Draw() error {
diff --git a/algs4/src/go/algs4/point2d.go b/algs4/src/go/algs4/point2d.go
index fb1d217..81d1c43 100644
--- a/algs4/src/go/algs4/point2d.go
+++ b/algs4/src/go/algs4/point2d.go
@@ -1,9 +1,10 @@
 package algs4
 
 type Point2D struct {
-	X      float64
-	Y      float64
-	Canvas *Canvas
+	X float64
+	Y float64
+
+	canvas *Canvas
 }
 
 func NewPoint2D(x, y float64, canvas *Canvas) *Point2D {
@@ -12,12 +13,13 @@ func NewPoint2D(x, y float64, canvas *Canvas) *Point2D {
 	}
 
 	return &Point2D{
-		X:      x,
-		Y:      y,
-		Canvas: canvas,
+		X: x,
+		Y: y,
+
+		canvas: canvas,
 	}
 }
 
 func (me *Point2D) Draw() {
-	return
+	me.canvas.Pixel(me.X, me.Y)
 }