The kids have been playing with K’Nex (“the world’s most creative toy”). Interestingly, they don’t always use it to make ‘machines’. Instead they do things like this.
What’s interesting about K’Nex is that it escapes from the ‘mechanical’ rigidity of products like Lego (and ye olde Meccano) and introduces flexibility and connectivity more like what one finds in nature. Clever stuff.