The Gigantic Robot is a 32-page board book written and illustrated by Tom Gauld, and published by Buenaventura Press. Each two-page spread has a single sentence on the left, and a hauntingly stark drawing on the right.
Gauld describes the book as a "wry fable concerning the production of an impressive secret weapon whose promise goes unfulfilled." I don't want to give away any more so I'll leave it at that.
The extremely short story takes place over an extremely long time period, and even though it took 60 seconds for me to read it, I went back and studied the powerful illustrations for a long time.