Add project files.

Pillar.cs

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+using SFML.Graphics;
+
+class Pillar
+{
+    public Sprite Top;
+    public Sprite Bottom;
+    public float X;
+
+    public Pillar(Texture topTex, Texture bottomTex, float startX, float gapY, float gapHeight)
+    {
+        X = startX;
+
+        Top = new Sprite(topTex) { Scale = new SFML.System.Vector2f(2f, 2f) };
+        Bottom = new Sprite(bottomTex) { Scale = new SFML.System.Vector2f(2f, 2f) };
+
+        Top.Position = new SFML.System.Vector2f(X, gapY - gapHeight / 2f - topTex.Size.Y * Top.Scale.Y);
+        Bottom.Position = new SFML.System.Vector2f(X, gapY + gapHeight / 2f);
+    }
+
+    public void Update(float deltaTime, float speed)
+    {
+        X -= speed * deltaTime;
+        Top.Position = new SFML.System.Vector2f(X, Top.Position.Y);
+        Bottom.Position = new SFML.System.Vector2f(X, Bottom.Position.Y);
+    }
+
+    public void Draw(RenderWindow window)
+    {
+        window.Draw(Top);
+        window.Draw(Bottom);
+    }
+
+    public bool IsOffscreen(float screenWidth)
+    {
+        // Rightmost point of the pillar
+        float pillarRightEdge = X + Top.Texture.Size.X * Top.Scale.X;
+        return pillarRightEdge < 0;
+    }
+}