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As necessary for creating a learner-centered environment, nowadays teachers are expected to be more mindful about their proximity distribution: how to spend time in different locations of the classroom with individual learners. However feedback on this is only given to teachers by experts after classroom observation. In this paper we present the design and evaluation of ClassBeacons, a novel ambient information system that visualizes teachers' physical proximity through tangible devices distributed over the classroom. An expert review and a field evaluation with eight secondary school teachers were conducted to explore potential values of such a system and gather user experiences. Results revealed rich insights into how the system could influence teaching and learning, as well as how a distributed display can be seamlessly integrated into teachers' routines.