2.5 stars? A strange one indeed, which is reflected in the divided reviews. A posthumous publication, the two editions have slightly different editing and wildly different presentations.
The Kirk edition opens on a small scale, bugs and beasties digging holes, illustrated in oils so flat and cartoony that they feel like digital art. And then the scale expands: a man, power tools, a train, a tunnel, the world opening, the scale growing wondrous and disruptive and strange, with increasingly dynamic and busy art to match. Whole pages are unique to this edition, the digger violent, destructive in the act of creation, "Its great arms lifted, paused, and swung the world it had dug up and put it somewhere else in the world." I don't know that I like the complete work; one half probably appeals to each kind of audience, and the combination is unmooring - productively, I think, but not enjoyably.
The Corbineau edition is more frenetic but also more consistent: vibrant, flat art admixes text and illustration, typography chasing the digging under the ground and through mountains while anthropomorphized diggers (both animal and machine) unify and sweeten the narrative. The ending is slightly different; I appreciate dropping the "hole to China" line in favor of a more Brownian repetition of "And the smoke trailed back, and back, and back."
Looks like Clement Hurd also did a version but, y'all, I can only delve so deep (read: the library I'm using doesn't have that version).
I feel like this was drafted as one of the books meant to earmark certain sections on a library shelf: boy's books, construction books, still MWB but a vibe that isn't going to grab me the way a different theme would. Given that, I at least appreciate the Kirk edition for its willingness to get weird - the growing sense of wonder is interesting, and I'll pick interesting any day.