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This paper focuses on a new form making method of spontaneous materialityunder limited digital control, as a supplement to the trending method of digitalmateriality. A specific emphasis is placed on the connection between materialselection and sensational expression in the contemporary information and digitaltechnologies era. Spontaneous materiality refers to the alteration of materialattributes by natural forces. The current techniques of digital materiality rely onaccurate digital control and inhibit from the intervention of any unpredictablematerial variable, which shows excessive scientific calculations and a loss ofartistic articulation in design. In the new form making method proposed here,intentional yet limited digital control sets the material framework where thecombination of soft and hard materials takes place. With the influence of gravityand spatiotemporal accumulation of selected materials, the fusion of softness andhardness brings a coexistence of different material states and qualities in oneobject. Thus an integration of shape and matter produces a blurring boundarybetween physical material and digital form, and more importantly, a sensationalexperience with expectational slippages of vision and touch. Additional to theongoing discussion of computation, this design research expands the potential ofcomputation by restricting its influence.