I have seen some unsuccessful spaces where teachers are attempting to operate as single cell classes within a shared space. This poses the problem of one teacher doing a quiet activity while another is in full blown noisy creative mode. A recipe for disaster. Invisible walls are often erected because it is what teachers know and are used to. Without time and energy allocated to investigating and planning to make effective change then how can we expect to just throw teachers, and children, into these spaces and for them to work out well?
I also get to see the other side of the coin. Spaces where teaching and learning is humming. Where the unique spaces within the environment are utilised for meaningful learning. Where teachers collaborate and co teach to get the most from their strengths. Where learners are given agency of their learning and are rising to the challenge. Where teachers have more time to spend with individuals and groups. Where learning is richer and learners are happier.