According to Wiki: The lines are shallow designs made in the ground by removing the reddish pebbles and uncovering the whitish ground beneath. Hundreds are simple lines or geometric shapes; more than seventy are designs of animal, bird, fish or human figures. The largest figures are over 200 metres (660 ft) across. Scholars differ in interpreting the purpose of the designs, but they generally ascribe religious significance to them, as they were major works that required vision, planning and coordination of people to achieve. Here is an example of a monkey geoglyph.
The heads were carved from single blocks or boulders of volcanic basalt, found in the Tuxtlas Mountains. Here is an example of an Olmec Head.
T constructed his own Olmec head out of playdoh.
We plan on studying ancient American civization more in depth in the coming weeks. T seems especially interested in them due to their close geographic proximity.