<p>Castells, or human towers, are popular in the Catalan region. The UpCycle Club were witnesses to one of these in action in Barcelona and recorded the climbers as they constructed a six-person tower in a crowded square. They then descended one by one, climbing down over one another. Watch the teamwork and co-ordination from those involved as they successfully take the tower apart! Credit: YouTube/UpCycle Club</p>
