Every now and then there comes a time for filling a gap in your work with children and young people in the Sunday School/Children's church program. The good people over at Building Faith website offer ideas here and there to help us with such moments.
This lesson from a year or two ago helps young people to think about the idea of the Trinity using the famous icon painted by Rublev. Using art to teach is a great and easy to use idea. The lesson is brief and could even be used in a children's talk. To be honest this could be sermon material too, or as a small group activity.
The theology of the trinity is tricky; it is easy to get it wrong. What's a heresy or two between friends!? But this short lesson locks it down simply and helpfully...
Have a look.