Recently, organic interactive devices, inspired by shapes and movements of nature and living things, have been attracting attention. In order to implement such behavior, programming skills and mathematical knowledge are essential. Due to this, for the potential users of the devices, such as product designers, it is too hard to apply the attractive interfaces to their works. We propose Intuino, an authoring tool that can prototype behavior through time-line operations, spline drawing, or other visual PC operations. The system enables the designers to concentrate on their essential works of interaction design, i.e., selection of the sensor and actuator, and tuning of their operations. Through various practical examples and discussion about them, we will show that our tool can make the prototyping process stronger and can also be used as the tool for facilitation, debugging or creativity support.