Ai's more significant exhibit at the Hirshhorn is entitled, "According to What?" It occupies virtually all of the museum's second floor. The pieces of this exhibit are more socio-politically controversial. Here is a wider view that shows both a crab and a steel re-bar exhibit.
It should be noted that, while Ai is responsible for the ideas behind his artwork, he employs others to do their actual "fabrication." Here are close-ups of the crab exhibit (the crabs are actually porcelain) . . .
and steel re-bar exhibit (which I understand was built from steel salvaged from buildings, including schools, that were destroyed in China's 2008 earthquake).
I liked the patterns created by the uneven ends of the pieces of steel.
And then there were antique pots that had been painted . . .
and antique stools that had been stitched together to create an interesting sculpture.
According to the plaque for this piece, the 40 stools had been created originally during the Qing Dynasty between the 1644 and 1911.
Ai had also created a relatively large wooden sculpture in the shape of the country of China.
This piece stood almost six feet high, so I had to hold the camera over my head and hope my aim was good enough to capture the work's "geography." Note that the separate "stalk" on the right is the island country of Taiwan, which China still claims possession of.
Finally, here is another sculpture whose significance I failed to note but which consisted of mostly wooden pieces packed closely together. I did like the appearance of the ends of the piece, particularly the metal elements that were interspersed with the wood.
For Ai this had political significance. For me it was just a matter of pleasing abstract design.
Taken with my Nikon D7000 with Nikkor 24-120mm f/4 lens.