What are the two types of rock art?

What are the two types of rock art?

There are two types of pictured rocks: petroglyphs and pictographs. Confusingly, some experts classify both petroglyphs and pictographs as being pictographs - - that is, they recognize the term pictograph to include both pictographs and petroglyphs.

What are drawings on rocks called?

Pictograph from Petit Jean State Park. Anthropologists and archeologists define rock art as images carved, drawn, or painted onto immovable rock surfaces. Images that are carved or engraved into rock are called petroglyphs. Images made with paint or other pigment are called pictographs.

What is so special about Mona Lisa smile?

The secret behind the Mona Lisa is that the "happy" part of her smile is actually buried in a low spatial frequency pattern. So if you're not looking directly at her mouth, her smile looks cheerful. But when you look directly at her smile, parts of it disappear into the background.

Why are there no eyebrows on the Mona Lisa?

One long-standing mystery of the painting is why Mona Lisa features very faint eyebrows and apparently does not have any eyelashes. ... The engineer claims that other eyebrow hairs that potentially could have appeared on the painting may have faded or been inadvertently erased by a poor attempt to clean the painting.