Imagine that as you work on a problem, another person's attempts to solve the same problem are visible to you, changing in real time. You might both be in the same room, or across a continent. When you get stuck, you look at her work for ideas. Likewise, she tracks your progress. Your collaboration may become explicit as you ask each other questions about how you did things, or it may remain in the background as a glance gives you a gentle hint about a possible direction for solution.
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