As a kid I always loved those cut-away books that showed the inner working of ships, or skyscrapers or factories. For this plumber's card design, it's essentially the same thing, though very graphic and abstract. The icon of the house is traversed by lines moving back and forth, as the hidden water pipes do in our homes.
About the designer
Jonathan Howells is a senior designer and illustrator with over 20 years experience. He is the Creative Director of multi-disciplinary design office Dinnick & Howells, whose past clients include Levi Strauss, Glaxo Smith Kline and Lindt Chocolate. A self-confessed design geek, Jonathan runs a typography blog and is obsessed with endless possibilities of letterforms.