This is where we are able to be curious about what we do, and we are willing to try and discover new things.
An example of something we might do is making slime / Oobleck.
This is where we start to make our own mind up about what we do, looking at different options and having fun.
An example of something we might do is Heuristic play - games using everyday objects.
This is where we seek out things to do, generally with other people, so that we can enjoy different activities with others.
An example of something we might do is playing a board game