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if my os was a workbench:

* i could only have one tool visibible at once.

* one tool must be the main tool.

* thing i was using the tools on, the "subject", is only visibile when using the main tool

* whenever i reached for another tool - the subject had to be hidden and scrambled into the big pile of tools i have

* if had more subjects / projects - whenever i stoped working on it i would either

        - pack it and all tools used for it away in a box and put it on top shelf or

        - put it into the pile of tools and subjects