Textual and alternative graphical representations for programs can be used interchangeably, text is just parsed into trees of symbols after all. This feels lik

Textual and alternative graphical representations for programs can be used interchangeably, text is just parsed into trees of symbols after all. This feels like a pretty obvious thing to do: are there programming environments out there that let you switch the view back and forth between textual and nontextual representations, designed to have good aesthetics/readability/editability in both forms?