Duncan Titmarsh is the only man in the UK that can call himself a 'Lego Certified Professional. And here's why!
He leads a team of people that build special sculptures out of Lego, and this year has been asked to build an advent calendar.
It's been built for the Christmas market in London's Covent Garden and the team have used over 600,000 bricks in the process!
Find out how it was done right here!