What inspires you?

Since working in the ad industry, I've started to pay much closer attention to commercials and ads than I ever did as a consumer. I analyze them, think about their effectiveness and scrutinize the art direction and copywriting. Sometimes I mentally file away a cool technique or concept and sometime I just shake my head at the poor typography or a bad retouching job. However, some commercial spur a long train of thought, deconstructing the ad and wondering how on earth the creatives ever came up with that idea. Knowing the absurd ways creative brilliance sometime presents itself, I invent stories as to how the creatives involved in this project stumbled across the seedling idea for this concept. How did it change? One commercial that recently sparked this train of thought for me was this Skittles commercial. How do you think the concept came about?