ELI5: Explain Like I'm 5

Color confinement

When we look at things like toys, animals, or anything around us, we see different colors. Colors make things look pretty and interesting, but did you know that the colors of tiny particles called quarks are important too?

Quarks are like the building blocks that make up bigger things like protons and neutrons. Think of them like small Lego blocks that make up a bigger castle made of Legos.

However, something strange happens when we try to pull quarks away from each other. They don't like being alone and they get attracted to other quarks nearby. It's like if you try to pull one Lego block out of the castle, it sticks to its neighboring blocks, making it impossible to separate them without breaking the castle.

This is called color confinement, which means that quarks are always bound together in particles and cannot be seen on their own. It's like they are trapped and can only exist as part of a group.

Scientists have figured out that this happens because quarks carry a special property called "color" (not the same as the colors we see around us). Quarks come in different colors like red, green, or blue, and they have to be paired up in a way that cancels out their color properties to form a neutral particle.

So, color confinement is what makes sure that quarks are always "stuck" together in particles and cannot be seen alone, like how each tiny Lego block is stuck together to form a big castle.