We are 8 days into an at-home vacation and getting to the "Moooom, I'm boooooored..." part of things. Then this book was delivered which I'd forgotten I pre-ordered. Within 10 minutes of its arrival my kids (my son is 7.5, my daughter is 11.5) pulled all the cardboard boxes out of the recycling and disappeared into their "workshop" to start building robots. They were frustrated at first that we didn't have any boxes big enough for them to wear, but I suggested "mini-robots" for the meantime and they were satisfied with some that were cereal box-sized. Other than the occasional requests for more materials (packing tape, scissors, art supplies) I have not heard from them since, and it's been hours. They are fully engaged in creating, building, and problem-solving. They aren't even bickering. Best money I've spent all year.