When my 5 yo ggd stayed with me we got out some cement stepping stones and those glass flat marbles and she glued the glass to the stone and she made one for me and one for her and Mom. Mine is outside in the flowerbed where she put it and hers in setting the hall at ther house. Mine has been rained on and it stays together just fine. We used craft glue and I was afraid it might come apart, but it hasn't and beleive me we have had some rain lately.