Writing coffee with the "coffee cup stains" is nice. The original stain that makes the "C" was probably enlarged to create the "f", overlaid to create the "e". The nice brown color that remind us of real coffee stain.
The Abduzeedo logo is heavily inspired by the Penrose Triangle and of course the Star Trek logo. The Penrose Triangle is indeed one of the biggest references and it still fascinates and intrigues me and my poor brain.