I turn 13 on @codepen today, so after my most hearted demos (https://mastodon.social/@anatudor/114499264888606204)... here are 13 of MY personal faves!
Pure CSS music toy - this one's a really special one for me https://codepen.io/thebabydino/pen/WNGPjLx
#CSS transforms for the #3D, CSS variables for the dynamic shading.