What is the two techniques called that creates value with Line when grouped together?

Look at las meninas by diego velasquez. this painting is a masterful example of the use of:

The caves at lascaux were closed in 1963 because a. vandals were destroying the paintings b. the collective breath of the many visitors caused the paintings to corrode c. the weather was destroying the paintings d. the government of france wanted scholars to be able to study the work without distraction

Very important answer ! if apple made a car would it have windows?