//and a thing for using//
By combining code and design, I think about automation, algorithms, or procedural design, where you can make more complex things than you could ever imagine. Having things always look great, as with responsive design. Or randomness, which is very hard for us pattern-seeking humans. Also, Variables to make the same, but different.
Check out the dedicated website for all 399 images and an explainer on how these images are composed.