just tried it on my 3 year old neph, he passed
Stage Two: Piaget termed this phase, the Pre-Operational Stage. He believed that we progressed through the development of these tools from the ages of 2 – 7 years old. This stage can probably be best simplified to our ability to deal with symbols, and the way we can form relationships between objects, language and our own actions. This is what is going on when a child runs around flapping his arms like a bird, or running around with a Tupperware lid serving as a steering wheel. The interesting characteristics in this stage are called Egocentrism and Conservation. Let’s take Egocentrism first, we here this term a lot. But what it really means in Piaget’s work is developing the cognitive skills and tools to overcome believing that your view of the world is everyone else’s (OK, this one’s just too easy… Do I even need to go into the variety of business, religious, political and other problems that this can and has caused) Piaget demonstrated this beautifully in what was termed the Three Mountain Problem.
Simply put, younger kids thought Piaget (or a doll, or anyone with another view) saw what they saw from their vantage point, and older kids knew there was a valid and alternative vantage point.
For instance there is a famous example in his experiments of asking a young child with an older brother, “Do you have a brother?”, the child will say, Yes. When asked “Does your brother have a brother?”, he often says, No. This is why 7 years old came to be known as the “age of reason”. This ability to turn the problem around to different perspectives and see consistency in seeming different arrangements is key to development in this stage.
Doesn't apply to every kid in the age range. Your nephew may be more cognitively developed.