[racket] Racket GUI Toolkit

Hi, I'm brand new to Scheme (thanks to my professor who is teaching us with
scheme in my Computing Theory and Programming Languages class this semester
at Sacramento State University​) and I happened to stumble across Racket
when searching for scheme-related things online.

I saw examples of the GUI toolkit at
http://docs.racket-lang.org/gui/Widget_Gallery.html. Are those examples
rendered entirely with Racket's drawing capabilities, or do they depend on
other things like GTK? I was wondering because the example images look
similar to Ubuntu.

*/#!/*JoePea
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