The real modeling supports a cooperative and communicative work of groups. Several efforts are being undertaken to improve the concreteness of modeling. This improvement of appearances of the virtual is not our aim. Their interface consists of a sensorised real elastic object which can be deformed with bare hands, thus deforming a 3-D shape model displayed on a computer screen. These sensorised bricks can be tightly 'attached' to virtual objects like the vertices of geometric structures in drawing programs.
Computation is embedded in many physical artifacts and spread throughout our environment.
All these approaches have a sensorization of physical objects in common. The implementation must provide a model about how to react on the changes that these bricks experience from their environment. This is different from our approach in which the hands of a user are sensorized and in which we implement a model about how to change the environment. From the recording of hand poses and gestures they generate a program for automated assembly. This concept has the same technological basis and difficulties as our concept, but it does not show a perspective to support the modeling process in general nor does it define a new user interface for human-computer interaction improving the process of understanding and communication.