[anthk]

Emacs allows inlince images since the first X-based release, even more with Emacs. Inline images on Email and everything.

Also, Email itself supports MIME too.

But no image will be concise enough against a good wall of text explaining it.

30 years ago was 1994. People used to post images under Usenet too. But a lot of these images without some annotation they are useless.