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Card-handling using hypertext editor can be a p owerful methodology for generation of ideas or understanding of complex problems. To support such activity, recognizing implicit structure in the arrangement of cards would be useful. But, because the structures to be r ecognized a r e by nature ambiguous and highly dependent on user-specic perception, it is dicult for conventional rule-based s p atial parsing algorithm to achieve this task. We propose techniques for building spatial parser suitable for nding such ambiguous structures based on the mechanics of human perception. Moreover, our parser is adaptively customized t o r eect a p articular user's preferences through an interactive suggestion process, supported by application of a genetic algorithm.

We introduce an inexpensive position input device called the FieldMouse, with which a computer can tell the position of the device on paper or any flat surface without using special input tablets or position detection devices. A FieldMouse is a combination of an ID recognizer like a barcode reader and a mouse which detects relative movement of the device. Using a FieldMouse, a user first detects an ID on paper by using the barcode reader, and then drags it from the ID using the mouse. If the location of the ID is known, the location of the dragged FieldMouse can also be calculated by adding the amount of movement from the ID to the position of the FieldMouse. Using a FieldMouse in this way, any flat surface can work as a pointing device that supports absolute position input, just by putting an ID tag somewhere on the surface. A FieldMouse can also be used for enabling a graphical user interface (GUI) on paper or on any flat surface by analyzing the direction and the amount of mouse movement after detecting an ID. In this paper, we introduce how a FieldMouse can be used in various situations to enable computing in real-world environments.

We propose an interaction technique for manipulating precise data or selecting one element from a large number of items.Although conventional graphical interaction tools like sliders cannot be used for selecting more items than the pixel size of the slider, we can specify more precise data by using the elastic slider based on the rubber-band metaphor, where a control object can be moved by pulling the object with a rubber-band between the object and the mouse cursor. The same technique can be applied to many graphical interface tools like scroll bars and drawing editors.

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