Okay, we’ve done challenges like this before in STEM club – spaghetti towers, marshmallows are far too messy, “buy” different types of building materials. I think one year we did it as part of STEM week and had to balance Creme Eggs on the top of a tower! It had never occurred to me to make this twist and make a Christmas Tree version!
Maybe part of the challenge could be to hold a particular star or tree ornament.
I love how you can adapt the other challenges, involve a planning session to get students to look into the best shapes involved to make a tower and then devote an hour to building a Christmas Tree. I think it would also be incredibly useful in an end of term lesson or even for a tutor-time activity. There might not be time to add it in for this year, but perhaps next year!