We've got computer graphics software that's so powerful it can generate images that make it seem like dinosaurs are back. But they still can't compare to the simple satisfaction you get from making a really complex hypotrochoid or epitrochoid with a marker and some perforated gears. So Nathan Friend was kind enough to build a browser-based Spirograph you're probably going to want to immediately bookmark.
Change comes slowly to the subway. Signs hang for decades. Trains are rarely replaced. A new line can take centuries. So the subway captured in these remarkable images by photographer Danny Lyon in 1966 feels almost contemporary–which is what makes it shocking that they were shot 48 years ago.