I was playing with my daughter and trying to teach her how to put different shaped blocks into the same-shaped holes in a little toy bucket. The triangle goes in the triangle hole. The squre goes in the square hole. The circle goes in the circle hole. If you don’t have the blocks matched to the right holes then they won’t go into the bucket. That’s just the way it works.
Maddie works with this concept for all of about two seconds before she grabs the bucket, takes off the lid, and places all of the blocks inside without further interruption.
We both learned something.