A skillfully done depiction of the gyri and sulci of the human brain. Via BoingBoing, where there is also a link to a "Museum of Scientifically Accurate Fabric Brain Art."
For comparison/contrast, here is a human skull that has been carved into a decorative bowl:
A kapala (Sanskrit for “skull”) is a cup made from a human skull used as a ritual implement (bowl) in both Hindu Tantra and Buddhist Tantra (Vajrayana). Especially in Tibet, they were often carved or elaborately mounted with precious metals and jewels.Other examples are shown at Oddity Central, via Criminal Wisdom.