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This paper presents a novel approach and interface to interactive image segmentation. Our interface uses sparse and inaccurate boundary cues provided by the user to produce a multi-layer segmentation of the image. Using boundary cues allows our interface to utilize a single "boundary brush" to produce a multi-layer segmentation, making it appealing for devices with touch screen user interface. Our method utilizes recent advances in clustering to automatically recover the underlying number of layers without explicitly requiring the user to specify this input.