Unlike modern Easter eggs which are often "on rails" (you click, you watch an animation, it ends), the Mr. Doob version is a true sandbox. You can pick up the "G" and throw it at the "e." You can try to stack the letters. The replay value is infinite because it relies on user interaction, not pre-canned animation.
To see the experiment in action, you can follow these simple steps on both desktop and mobile devices: google gravity slime mr doob best
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