Lego and Jung von Matt, Stockholm have teamed up for a promotion that will see kids decorate the windows of department store NK for an evening, using Duplo blocks - with consumers having to guess what they're making. On Tuesday 7th August between 6.30 pm and 8.30 pm people will be able to watch kids from the ages of two to five building with Duplo either through the windows or on a website where they can watch in real time. The first person to discover what the kids are building will win Duplo worth 5000 Swedish kroner. In this promotional video, the kids give us some clues.