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We present sweepers, a new class of space deformationssuitable for interactive virtual sculpture. The artistdescribes a basic deformation as a path through which atool is moved. Our tools are simply shapes, subsets of 3Dspace. So we can use shapes already created as customizedtools tomakemore complex shapes or to simplify themodelingprocess.When a tool is moved it causes a deformation of theworking shape along the path of the tool. This is in accordancewith a clay modeling metaphor and easy to understandand predict.More complicated deformations areachieved by using several tools simultaneously in the sameregion.It is desirable that deformations for modeling areýfoldover-freeý, that is parts of deformed space cannotoverlap so that the deformations are reversible. Thereare good intuitive reasons to believe that our deformationsare foldover-free but we have not yet completed aproof.We have an efficient formulation for a single tool followinga simple path (translation, scaling or rotation) andwe can demonstrate the effects of multiple tools used simultaneously.For representing shapes,we present amesh refinementand decimation algorithm that takes advantage of the definitionof our deformations. The prototype implementationdescribed has been used to create a variety of modelsquickly and conveniently.