[Therion] walls off

[Nikita Kozlov]

So main idea there, that you modify the way how therion would draw symbol
a_dimensions.
In my previous advice you will obtain walls like in red area of attached
screenshot.

You can play further with metapost code, altering drawing by for example
pen with transparent color
(i.e. pickup your_transparent_pen), or commenting out the whole thdraw P;
expression completely.
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