    },
                turtlesSize: {
                    slider: [0.8, [.2, 1, 0.1]],
                    cmd: val => {
                        view.drawOptions.turtlesSize = val
                        if (!anim.isRunning()) view.draw()
                    },
                },
                turtlesSpeed: {
                    slider: [model.speed, [0.2, 1, 0.1]],
                    cmd: val => model.speed = val,
                },
                turtlesColor: {
                    color: view.drawOpt