 It is also not known how Olmec-influenced art came to be painted hundreds of kilometers (or miles) from the Olmec heartland, although caves are prominent on many Olmec-style monuments, including La Venta Altars 4 and 5.The Paintings cover an area of about There is restoration work in 10 walls, it is expected to complete scientific investigation and establish the origin of the paints used in the designs.The best-known samples of Oxtotitlán paintings are those part of the core group.