```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Switch ON</title>
<style>
.container {
width: 100vw;
height: 100vh;
position: relative;
}
.circle {
width: 50px;
height: 50px;
border-radius: 50%;
background: yellow;
position: absolute;
top: 0;
left: 50%;
transform: translateX(-50%);
}
.rectangle {
width: 100px;
height: 100px;
background: aqua;
position: absolute;
bottom: 0;
left: 50%;
transform: translateX(-50%);
}
</style>
</head>
<body>
<div class="container">
<div class="circle"></div>
<div class="rectangle"></div>
</div>
<script>
let switchStatus = true; // スイッチがONかどうかの状態
function generateCircle() {
let circle = document.querySelector('.circle');
circle.style.top = '0'; // 初期位置に配置
let interval = setInterval(function() {
let topPos = parseInt(circle.style.top, 10);
if(topPos >= window.innerHeight - 50) { // 画面下端に到達
clearInterval(interval);
circle.style.display = 'none';
} else {
circle.style.top = topPos + 1 + 'px'; // 下に移動
if(topPos >= window.innerHeight/2 && topPos <= window.innerHeight/2 + 100) { // 四角形の範囲に入ったら消える
clearInterval(interval);
circle.style.display = 'none';
}
}
}, 10);
}
setInterval(function() {
if(switchStatus) {
let circle = document.querySelector('.circle');
circle.style.display = 'block';
generateCircle();
}
}, 2000);
</script>
</body>
</html>
```
