What are these things?
From 2006 to 2010, I had the honor of designing the conference badge for DEFCON, the largest and oldest continuously running hacker and computer security convention in the world. DEFCON is a mix of good guys, bad guys, government officials, and everyone in between, all focused on having fun, sharing technical information, seeing old friends, and learning new things. What originally started as a small gathering of a hundred people from a local bulletin board system has expanded into tens of thousands of people making an annual pilgrimage to Las Vegas to celebrate all forms of technology subversion and underground culture.
DEFCON is often regarded for being ahead of their time with its unique, colorful badge designs, using materials and manufacturing methods not typically seen at conferences, like laser cut acrylic, lenticular printing, and liquid filled pouches. As far as we know, we were the first public conference to incorporate artistic, functional electronics into an attendee badge.
I built each year's badge upon the successes, failures, and feedback from previous years and ultimately resulted in a series of five consecutive electronic badges each with various features and functionality.