cture, and finally commerce and fashion are the fastest layers. In a loosely‐coupled way, each layer depends on the layer below. In turn, the accumulation of each successive layer enables an “adjacent possible” filled with more opportunities.</p>

<p>Likewise, the expressiveness of <abbr>CSS</abbr> and JavaScript is only made possible on a foundation of <abbr>HTML</abbr>, which itself requires a <abbr>URL</abbr> to be reachable, which in turn depends on the HyperText Transfer Protocol, which sits ato