It's semi-serious. It's easier to learn things when they have colors associated with them and colors have been shown to affect our moods.

• Pink is soothing.
• Gray is a mix of black & white. Black shows discipline. White unifies. So gray would be a unifying discipline.
• Yellow and orange both add cheer.
• Teal is a greenish-blue. Green is refreshing. Blue is relaxing.

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