Relatedly, if you're reading the page on a high-DPI screen and wondering why the pictures are so dark and blurry, try opening your browser's JS console and running this:

  document.head.appendChild(document.createElement('style')).sheet.insertRule('img:not(:hover) { image-rendering: crisp-edges !important; }', 0)

Line/pixel art especially suffers from the rescaling filters that came with retina displays.