On a mobile phone it makes a lot more sense. Try shaking it!

It doesn’t in my case, I see some weird animation, everything disappears, “pour” button again. Shaking or any other movement doesn’t help. Latest chrome on iOS

Works for me in Safari — iPhone 17 Pro, all up to date

I wouldn’t call it realistic, sand gets stuck in the air, stones don’t rotate, and there’s quite an uncanny valley effect based on angles. Still a cool demo of what is possible, even though I get 10fps or something on a iPhone 15 Pro

What do you mean "stuck in the air?" It's top down.

Reminds me of this demo game https://store.steampowered.com/app/3216520/Sandcastle/