My grandson - between the ages of 18 months to 2 yrs.
Some imagination and independent thought begins.
No longer a pure, immediate reaction to immediate environment ie, trigger, response, trigger, response, trigger, response...
but some problem solving and use of memory to try to predict outcome.
Mostly to manipulate adult behaviour in so much that he hopes he can get what he wants.
Some call this stage the 'Terrible Twos'
I find it the most amusing & amazing stage of development.
Yes, he has more ideas than vocabulary to describe those ideas and frustration will follow but to watch him put the information he's collected over the past two years to use to assist him in all areas of his daily discoveries is quite something.
He's also developing a sense of humour
Because I have a rough idea of the developmental stage he's at I find I'm more (inwardly) amused at his attempts to fulfil his desires.
Because I know what he's up to and what's motivating him,
I secretly admire the way he constructs his cunning plans to sweet talk more ice cream out of his grandad, later bedtimes, dessert before main course at meal times, every toy he owns out at the same time and not help put them away etc.
He's realised his efforts are wasted on me. He knows resolute & stoic when he sees it.
But it's amusing to watch him play the unsuspecting like a fiddle, in the hope of getting what he wants