2D Artist and Art Director at Urban Scale Interventions Greg Edwards has unveiled a fantastic infinite sketch that contains multiple worlds within itself, which can be endlessly zoomed in. To create it, the artist used Endless Paper, an app for iPad and Apple Pencil powered by a Fractile vector rendering engine. The app gives you access to an infinite canvas, which can handle millions of strokes on screen, thus allowing its users to create infinite projects.
And here are some beautiful sketches by Greg: