Tunnel vision

Finally my first Turtle! Nothing fancy but I like it :)
Don't stare too long in the middle it will give you a headache.

// You can find the Turtle API reference here: https://turtletoy.net/syntax
Canvas.setpenopacity(2);

// Global code will be evaluated once.
const turtle = new Turtle();

// The walk function will be called until it returns false.
function walk(i) {
    turtle.forward(120);
    turtle.left(180);
    turtle.forward(115);
    turtle.right(10);
    return i < 40;
}