This wasn't for any specific challenge but more of a personal one. I usually like to make ATCs with a focal point and work around it but for this ATC I decided to just have fun and be a bit more abstract. This ATC is representing 'steampunk'. I am quite familair with steampunk although I have not used it as inspiration in my work before. I am pleased with the result aesthetically even if it is quite different from my usual style which is a lot more whimsical.
Look out for number two and three where I tried different sources for inspiration.