Well, it could be that the kids are having a storytelling session or maybe they're engaged in a simple circle dance. There are various possibilities.
The kids might be playing a game or having some kind of group activity.
Often, in such a cartoon, the kids' poses and gestures within the circle could tell a story. The use of brown could imply a warm or earthy tone. Maybe they are in a circle to protect something or to show support for one another.
They might be running around, laughing and having a great time.
They might be having a group discussion or sharing stories.
Perhaps they are sharing stories or just enjoying each other's company in a circle. It could be for various reasons depending on the context of the cartoon.
The brown kids might play games, watch cartoons, or have story-telling sessions during cartoon circle time.
In the cartoon, kids doing assignment could be seen consulting books, having discussions with classmates or seeking help from teachers.
The kids might be solving math problems or having fun with math games in the cartoon.
The kids might be conducting experiments or exploring new scientific concepts.
They might be playing games or having a picnic.
They might be telling stories or just enjoying the warmth of the fire.