sandglass 2d
A free physics simulation — play it in your browser, no install. 可以随手机倾斜、翻转的二维沙漏：自然堆砂、静摩擦与轻量本地模拟。A mobile-first 2D hourglass with granular physics.
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Open the live demo Source on GitHubFrom the README
一只可以随手翻转的二维沙漏。让砂慢慢落下，堆成小山，再翻过来玩一次。
打开沙漏 · 免费，无需登录，手机和电脑都能玩。
拖动沙漏来倾斜，双击画面或点「翻转沙漏」把它倒过来。 手机打开后默认使用传感器。 如果浏览器要求授权，点「点击授权手机传感器」并允许。竖着握住手机，慢慢转动或轻轻摇晃，看砂散开后重新堆积。 平放手机，砂会被前后壁面的摩擦稳住。 倾斜到足够角度或摇晃后才会滑动；这是一只很扁的容器，平放不等于失重。 点 Ⅱ 暂停，再点一次继续。右下角的 ⛶ 进入沉浸模式，点「退出沉浸」返回。浏览器允许时会全屏并保持屏幕常亮。 右上角 ☰ 可以换砂的颜色、调整传感器方向或重新装砂。 电脑上也能用 ← → 倾斜、F 翻转、空格暂停。
没有传感器、不想授权，直接拖动就可以。传感器模式下拖动或点翻转会回到手动模式。翻转保留现有沙粒；「重新装砂」才会恢复起始分布。
请在 Safari 或 Chrome 中直接打开上面的 HTTPS 链接，再尝试授权。部分内置浏览器不提供运动传感器。竖直握住手机时，如果砂往上走，在设置里切换「传感器方向反了」。
读数中断时会显示提示并将重力归零，恢复读数后继续。也可以点「回到手动把玩」。切到后台会暂停计算，回来后不快进补算。所有模拟和传感器数据都留在本机，没有账号、统计或数据上传。
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