We're putting the final touches on the upcoming (revised) Metamath book.
If you're curious, here's the current draft of the book cover:
https://dwheeler.com/misc/24804269_cover-2.pdf
If anyone has comments/concerns, please let us know ASAP!
The images may get some updates.
The plan is to use aleph zero on the front cover, just like it's on the
front page of the website... it seemed like the obvious image to use.
I'm happy with the aleph zero (aleph null) on the current draft cover, but it may get a replacement.
Norm's picture may be changed to
http://us2.metamath.org/norm2011.jpg
Here's the issue discussing the book cover:
https://github.com/metamath/metamath-book/issues/208
--- David A. Wheeler