Jens, thanks for your reply and sorry for the delay in mine.
2014-12-02 13:20 GMT+01:00 Jens Axel Søgaard <jensa...@soegaard.net>: > Is it box and pointer diagrams? > > If so, install metapict and let me know how this works: > > https://github.com/soegaard/metapict/blob/master/metapict/box-and-pointer-diagram.rkt > While they do use box and pointer diagrams in lecture 2a, I was not referring to them I was rather referring to the capital A drawn in a rectangle. And then they introduce some functions that act on such drawings, for example one function flipped them Some other functions stretched them or repeated them several times to create fancy patterns. I have taken 3 screenshots from the lecture footage for your reference here: https://www.dropbox.com/s/8dcht9buge9eovy/screenshot3.png?dl=0 https://www.dropbox.com/s/gab1t09p9b3xj97/Screenshot2.png?dl=0 https://www.dropbox.com/s/kvwo622gv1opem8/screenshot.png?dl=0 Thanks again
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