Activity – Trinity Rings

This activity makes for some interesting mathematical fun as well as a a great take-home reminder of the mystery of the Trinity. The fact that I can’t quite get my head round it does not mean that it is not so. Works with maths. Works with God too.

We’re going to make some joined-but-not-joined loops. They’re called Borromean (borrow – ME – an) rings and they’re a popular mathematical curiosity. I have friends who have wedding rings like this.

A fun opener is to flash this picture up briefly and say you’ll give a huge prize for anyone who can identify which ring is on the top.


Who said blue? No, ignore the yellow loop and you can see that blue is below red.
Who said red? No, ignore the blue and you can see that red is below yellow.
So yellow must be on top, right? But ignore the red and we can see that yellow is below blue.
But blue was at the bottom, wasn’t it?

The answer? They all are. And none are. It’s a bit of a mystery. How can yellow be at the top and at the bottom? It doesn’t make sense. Nevertheless, it is so.

It’s a bit like that with the Trinity. How can God be three and one? It doesn’t make sense. Nevertheless, it is so.


To make your own set of Borromean rings, you will need some sticky tape and three strips of paper. These need to be five to ten times as long as they are wide. I’ve used the width of A4 x 2cm. Alternatively three plastic ties or three glow sticks with joiners. Glow sticks or narrower strips of paper (1cm) make a wearable child’s bracelet.

If you want, you can write the qualities or roles of the three persons of the trinity on the strips of paper. Join two strips to make loops and place one inside the other. The first picture shows the orange loop inside the blue loop. Do not link the loops.

Then take the third strip (yellow) and thread it inside the inside loop (inside the orange), then outside the outside loop (outside the blue), then back inside the inside loop and join the ends outside the outside loop.

So that’s inside, outside, inside, outside, join.

You now have three loops all joined together although, strangely, no one loop is joined to any other. Don’t believe me? Try breaking one of the rings. The other two come apart. They are not joined.

If you use thinner strips, the rings can be opened out into the familiar trinity symbol, or you can flatten them together to make a bracelet. Wider loops make a ball or a cube.


If you want to use glow sticks or wire ties, an alternative construction may be simpler. Make two rings, as before, and lay one on top of the other, overlapping about half. Thread the third glow stick over the top (pink) ring, under the bottom (white) ring, over the top ring and under the bottom ring. Then join the ends.

The glowstick pictures for this post are not mine, they belong to a fascinating mathematics blog called Coffee Cup Cardioid.

Suggested Texts

  • Matt 28:19
  • 2 Cor 13:14
  • 1 Peter 1:1-2

Or the readings for Trinity Sunday: years A, B and C

  • Genesis 1:1-2:4a
  • Psalm 8
  • 2 Corinthians 13:11-13
  • Matthew 28:16-20
  • Isaiah 6:1-8
  • Psalm 29
  • Romans 8:12-17
  • John 3:1-17
  • Proverbs 8:1-4, 22-31
  • Psalm 8
  • John 16:12-15
  • Romans 5:1-5


5 thoughts on “Activity – Trinity Rings

  1. Thank you for this wonderful post. I find Trinity Sunday is always a difficult one for Sunday School. I teach Sunday School and try to make the lessons and activities tie in with the lectionary. Off to buy some glow sticks (and keyrings) now. I am bookmarking your blog. Sounds like just the sort of thing I need. Love your blog name, by the way.


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