I think he gets it from me.

When I was a kid, this is what I did:

Step 1- Gather the objects.

Step 2- Line them all up!

And if you don't have toys available?  No worries, there are PLENTY of other things to use.

Examples

Things to cuddle

Trucks

Blocks and trucks

And if you get bored of location, just take it outside!  (but please let your parents know first)

I heard the glass door open and close several times and when I came to scope it out I saw Jakob piling his toys on the front porch, pajama's and all!  He was trying to gather EVERY. SINGLE. TOY!  It was entertaining...until he decided to ride his bike without shoes.