The Dead Fish Museum allowed a viewer to physically step into the decayed aftermath of our postmodern ocean and traverse it (temporally), ultimately arriving in a time when fish are larger, more substantial.

from Roberts, Callum The Unnatural History of the Sea, pp.255-256:

Decline in the marine megafauna has come comparatively recently to the Gulf of California. Times of plenty are still remembered by the oldest fishermen, whereas younger generations are already beginning to view the depleted environment as normal. In the terms of fishery scientist Daniel Pauly, their "environmental baselines" are shifting. When baselines shift, each new generation subconsciously views as "natural" the environment they remember from their youth. They compare subsequent changes against this "baseline," masking the true extent of environmental degradation, even to the degree that they no longer believe anecdotes of past abundance or size of species.
...
In most parts of the world, human impacts on the sea extend back for hundreds of years, sometimes more than a thousand. Nobody alive today has seen the heydey of cod or herring. No one has watched sporting groups of sperm whales five hundred strong or seen alewife run so thick up rivers there seemed more fish than water. The greater part of the decline of many exploited populations happened before the birth or anyone living today...Where human impacts on the sea extend far back in time, it is easy for us to view the diminished productivity of today's seas as normal. We have known nothing different.