Thank you, I will add the link to the srfi, if you don't mind.

Jens Axel Søgaard <xxxxxx@soegaard.net> 於 2020年7月10日週五 02:42 寫道：

FWIW the current implementation of sicp-pict is

https://github.com/sicp-lang/sicp/blob/master/sicp-pict/main.rkt

/Jens Axel Søgaard