It's about sorting. Which requires the mental ability to organize and categorize random objects on varying attributes. No small task for such little minds!
And every time he sorts out one pile, that cheeky little Oscar dumps another pile with different criteria.
"Honey, it's time to turn the computer off now", I say.
He responds "I CAN'T Mama. Oscar keeps dumping more trash. I HAVE to organize it".
On a related note, since acquiring our new swanky vacuum cleaner last week, Spud has requested to vacuum the apartment for a minimum of 3 times per day. Second only to computer games, this kid loves to vacuum. Sorting trash and sucking up dust bunnies for fun? Man I love that kid.