<DIV>This weekend i saw a great concert/video interaction by Portuguese artists Miguel Carvalhais, Pedro Tudela (@c )and Lia. During the concert there was a screen where some 2D forms reacted to music. And one of the most intriguing effects i saw was this:</DIV>
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<DIV>- imagine little white squares falling in the screen, like rain. But, at a certain moment, the squares would leave a trace, or in other words, the square falls a path from top to bottom but as the square falls, the previous square position would be present. It's like a "delay" or echo effect forming a vertical line from top to bottom. Then, as some other squares with a different color apears (grey), it deletes the previous paintings done by the other squares. </DIV>
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<DIV>It's hard to me to explain, so try to look at this link: <A href="http://www.at-c.org/?p=30x1.3">http://www.at-c.org/?p=30x1.3</A>.</DIV>
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<DIV>I know how to move squares in GEM and follow a path and that. But as i move the square, the previous position disappeas. I want to "freeze" the time, so to speak...</DIV>
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<DIV>Now, is there any object in GEM that allows this? If not, could you give me some hints or ideias of how to do this? i really like the ideia and i want to explore this and adapt to my own ideas.</DIV>
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<DIV>Thanks in advance.</DIV><p>
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