Update: my sister responds:
It was not 1994, but 2003 or 2004?... After I had attended a conference in Baltimore, MD, and purchased my crab hat!
Baltimore is quite proud of its crabs.
These were kids in Charlottesville, at a school where I taught ESL (few months, substitute position), a couple of years before my trip to Korea.
The students were learning science words related to how plants grow. Hands-on science projects were part of the methods used to help reinforce learning, make learning more fun, make assessment a bit more 'real'. [Interesting memories stirred up by that photo]