Recycling, Covers from an eMac a Mac monitor turned into a "MacAquarium's".

eMac, was released before the iMac.

In Australia, there are fish tanks 14 inches wide, which matches up the internal width and depth, and height of the Mac cover.
To try and keep up the use of Apple products, and old iPhone4 is being used as the light source.
The front of the Mac cover lifts up easily to feed the fish, and to clean the tank.
Hence, the conversion was the cost of a fish tank.