These truly adorable pin badges depict different Android "characters". There are 87 different characters in total, and they're scattered across the eight giant halls of Mobile World Congress.
What results is a mad panic among visitors here in Barcelona to collect as many as possible across the days the conference takes place. Business-folk in sharp suits regress decades as they trawl the halls trying to find the pins. You can easily spot crowds of adults gathered around tables, trading the pins they have spare.
It's all lovely, if not a bit odd.
This year, (with a bit of help from Google if we're honest) we succeeded in collecting every single badge from the show, including the bronze, silver and gold "kingpin" badges, awarded for collecting all the badges. Take a look through at my favourites from the bunch, and the full collection at the end.