spinning econs

Are you referring to the images that flip on hover to show some other text?
These are using CSS for the effect. You can use your browser Developer Tools to inspect the code of the page and see the CSS which has rules such as
transform: rotateY(180deg)
and

backface-visibility: hidden;
perspective: inherit;
transform-style: preserve-3d;
transition: transform 0.8s cubic-bezier(0.5, 0.2, 0.2, 0.8) 0s;

You can read about this CSS at MDN
https://developer.mozilla.org/en-US/docs/Web/CSS/transform
https://developer.mozilla.org/en-US/docs/Web/CSS/perspective