I saw this exhibit just yesterday at MOMA, it's amazing! And it does also explain that what looks like "Hoarding mentality" on the part the artist's mother is actually the manifestation of the indoctrination of the Chinese Government that taught its citizens to not waste and save and/or to reuse everything. It's really a remarkable exhibit.
I never knew before this moment that such a thing as "Cat Ladders" even existed, and now I also find out that there's an entire blog dedicatedc to them. Amazing.
But yeah, misspellings on Highway, etc. signs are inexcusable.