The black squares spell out "MOM," and there are six unchecked boxes in the grid that spell it out twice more. Add to that a smattering of "Mother ____" clues, a final wish at 122D, and you've got a nice Mother's Day tribute puzzle.
All that black square manipulation resulted in OVOLO (22A: Quarter-rounded molding) (?), POLEBARN (59A: Simple storage unit on a farm) (huh?), LEUMI (75A: Bank of Israel) (You don't say), ISSY (129A: Paris suburb on the Seine) (We've been to Paris a lot, and we still think this is a stretch!), but still, there's some very nice fill, too. It's a small thing, perhaps, but I like seeing WHET (30D: Hone) in there, and there are a lot of good, long, down answers. AVANTGARDE (60D: Pushing the envelope, say), MATURATION (28D: Coming of age), LAUGHLINES (75D: Most people don't think they're funny) (nice), are all nice.
Interesting clue for SHIHTZU (100A: Literally, "lion dog"), and 118A: What unicorns don't do (EXIST) made me laugh, and they got us AGAIN with 102A: Second of six? (SHORTI)! But how is 59D: See 54-Across (AI) a clue for KOREA?
Lastly, I don't think UDDERS (101D: Milk dispensers) or SEXUP (107D: Make more alluring) should have been included in a puzzle devoted to mothers.
It seemed like I complained a bit about this, but I still think it was a pretty good Sunday.