Whether it's in the cemetery or at home, the Mexican culture believes in creating altars to celebrate the dead.
Click the links below to see the many different types of altars and what they represent:
http://www.azcentral.com/ent/dead/altar/
http://www.dayofthedead.com/content/traditions-altar
http://www.houstonculture.org/mexico/photoj.html
http://www.houstonculture.org/mexico/mas.html
http://gomexico.about.com/od/dayofthedead/ig/Day-of-the-Dead-Altar-Photos/
