The text at the very end of the article explains more. It appears Wittgenstein wrote a dictionary for children he was teaching in Austria after he left Cambridge, these illustrations were created for the first English translation of that dictionary that is recently published, also noted here:

http://moussemagazine.it/paul-chan-drawings-for-word-book-by...

And you can purchase the book here:

https://bookshop.org/books/word-book-9781943263240/978194326...