This paper describes two practice-led research projects in the tangible representation of environmental time-series data. Weather Bracelet (2009) and Measuring Cup (2010) compress fine grained data sets into small, tactile objects realised using 3d printing. Here these works are examined as case studies in the context of a nascent practice of data sculpture. After discussing technical, conceptual and creative considerations in these works, the paper addresses challenges for the interpretation of data sculptures, especially their claim of veracity. Finally the paper questions 'sculpture' as a framing term for these objects, proposing a broader category (dataform) that better reflects the potential cultural value of this practice.