I think my cat has adopted my kids obsession with legos. I get it when she is playing with the legos along with the kids, but she plays with them when they’ve left them out and have wandered off as well. She will dig around the bins and bury her head in it until she finds whatever lego she is looking for. Then she takes it out and bats it around for a bit until she decides she needs a different lego. Then she hunts through the bin again. She’s as intent on picking out the right lego as the kids are.