Creating these sliding doors will challenge your child's problem-solving skills and help to develop their knowledge and understanding of how things work - in this case, how automatic doors work. The activity will also help to improve their hand-eye coordination and fine motor skills as they carefully cut the cardboard box, push the bottles into place, attach the paper fasteners and hook the string into position to make the doors open. The make is quite difficult and you'll need to be on hand throughout to help your child.
How to extend the magic
Go on a tour of your home and spot all the different types of doors you can see together - your front door, doors to the different rooms, back door to your garden, patio doors, oven door, washing-machine door, door to the bathroom cabinet, door on a toy car, etc. Then when you are out and about, see what kind of doors your child can spot, eg garage doors, bus and train doors, shop doors. Some will be automatic doors like the one Nina was demonstrating.