Junior capable of what?

I watch him playing
Setting Lego pieces
In order by size, colour
Purpose.
No scrambling around.
Methodical.
Should this be a
Five year old’s way?
At play?
Bespeaking the engineer
Or teacher or researcher.
But all the while he
Sings one of those
Dumb songs from cartoons
Saturday morning.
Has the tune just right
And tempo.
And words.
Quite funny, really.
Songs, writing, he might.