Shape Stamping
In this floor projection example, people are encouraged to stamp on the shapes. The camera pans up to the projection source. The way this camera set-up works is that they have the projector placed next to a sensor, which detects where the movement is, and tells the computer accordingly, as explained here
iBar
This is a very clever installation, when someone places an object on the bar it's position is found by the computer and is highlighted by light around it. When someone slides an object down the bar the light follows the object and creates a bolt of light down the bar.
I would guess that this is a very different set-up to what I will be doing, but the principles are similar to something I could create. By telling the computer to, when it detects an object, create an image or particles in the position of that object.
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