Milwaukee Public Museum director Dr. Stephan F. de Borhegyi spent many years excavating in and around Lake Amatitlán in Guatemala. This area was occupied over a great length of time by the Maya, from 500 BC to the Spanish Conquest (about AD 1500). Many items were brought up from the lake by divers, including several ceramic censers, containers used to burn copal incense, which played an important role in Maya rituals. The Milwaukee Public Museum is one of the primary repositories of artifacts from sites from this area. The Museum website has a page on the Lake Amatitlán collection and its history. You can also see the Lake Amatitlán exhibit on the Museum’s Pre-Columbian mezzanine.