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Last updated at 10:18 am UTC on 5 March 2018
Plumbin' was created by Ward Cunningham back around 1985 in Tektronix Smalltalk as an exercise to show how much can be done with MVC, and how easily.

A modern Morphic version now exists, primarily as an example in using drag and drop within Morphic.
Screen Shot 2014-01-11 at 5.00 PM.png
You can load this from squeaksource
    location: 'http://www.squeaksource.com/PlumbingDemo'
    user: ''
    password: ''

Jump over to Drag and Drop Explained to learn about how drag and drop works.

Ward did update his original for Squeak in '97 (and added colour); this version started from his code and modified quite a lot.