What are blue and green parts?

A blue part is something that helps things move smoothly together, and a green part is what makes those movements happen in the first place.

Imagine you're pushing a toy car across the floor. The wheels are like the blue parts, because they help the car roll easily on the floor, kind of like how your shoes let you walk without slipping. The green parts would be like the hand that pushes the car, or the batteries inside a remote-controlled car, they’re what start the movement.

• Blue parts are like the wheels and roads, they help things move without too much struggle.
• Green parts are like the people or machines that give energy to make things move.

So when you press a button on a toy, the green part gets excited and sends energy to the blue part, making the toy zoom forward. It's like giving your friend a nudge so they can run faster!