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Spatial Interaction (SPINT) is a non-contact passive interaction method that exploits a depth-sensing camera for monitoring the spaces around an augmented virtual object and interpreting their occupancy states as user input. The proposed method provides 3D hand interaction requiring no wearable device. The interaction schemes can be extended by combining virtual space sensors with different types of interpretation units. The depth perception anomaly caused by an incorrect occlusion between real and virtual objects is also alleviated for more precise interaction. The fluid interface will be used for a new exhibit platform, such as Miniature AR System (MINARS), to support a dynamic content manipulation by multiple users without severe tracking constraints.