When I was a kid in the late 60s and very early 70s, there were a lot of toys that looked cool but they only did one thing and that one thing ceased to be entertaining in a few minutes.

After much nagging, my parents got us a remote-controlled toy flatbed semi-truck. The remote control operated with a wire about three feet long, and the truck was about two feet long.

You could drive the truck around the playroom a little bit. It crept along on its little wheels.

And that was it. Entertainment value for about five minutes.

Same for a toy plastic hovercraft, about a foot long, oval-shaped. You held a little motor in your hand, and the motor was attached to a long, thin hose, like the clear plastic hoses you found in a fishtank. The motor operated a fan that blew air through the hose and caused the lightweight plastic toy hovercraft to float.

You couldn’t steer the hovercraft. You could drag it around on the floor for a bit. Then what? Entertainment value: About five minutes.

It’s a cliche, but it’s true: The best toys are simple and open-ended. Blocks. Big cardboard boxes — the kind that a washing machine ships in. Snow that can make into a fort or castle.

I remember when I was about 11 years old, sitting on the floor in the playroom and building vast brutalist palaces out of Lego bricks. It was a meditative activity. You have a lot to think about when you’re 11 years old.