There was some discussion of trying to implement iemguis and unauthorized guis using data structures. Frank has already implemented sliders and a [grid]-style object. It seems to me that this would be the ultimate way to handle this in a native Pd way.
i agree this would be a good thing, that is the ability to map the pure data structures to things like blt::vector's or named tcl arrays, for those not content with using mere shapes on a canvas! and then define the gui which 'houses' the mapped data in simple tk, something similar to the miXed/ '.wid' format but eliminating the need to think/code add|remove|update|sync each and every...
oh and to keep this thread on topic, do you find:
<list>this list<list>inside<list>a list</list></list></list>
to be more human readable than:
this list {inside {a list}}
?
c