In the collaborative space of my math class, students usually work in groups of 3 or 4 which I've assigned. And yet, sometimes it may better to allow students to work in pairs, or to shuffle the groups, or allow a particular student to work on their own. This sort of flexibility has to exist within a classroom where structures have already been established, but it's great to have that flexibility. I was moved to reflect on this after reading a great piece, with photos, about flexible learning spaces in libraries. Check it out! It's About Information: Flexible Learning Spaces. How do you make your classroom a flexible learning space, what are the challenges of doing so, and how do you deal with them?