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For a similarly accessible lisp implementation, see Scheme48 which was originally written in two days.

There are actually a few of these.

And Scheme in one defun (SIOD), although it seems the recent version of this has been split into multiple files.

Another is s7, one C file to embed. I use it for computer music, I love it. It's a Scheme that is heavily influenced by Common Lisp.

s7 is amazing, but at ~100k loc it's hardly at the same scale

ha, I guess thats true. Instead of a SIOD, it's a SIOBFD. ;-)

It's similar in terms of ease of embedding, being all ANSI C, and coming from a TinyScheme, originally...

The mark sweep GC implementation is beautiful in its direct simplicity.