Organum added what to gregorian chants?

guitar music
a choir
a second voice
lyre accompaniment

What are the two ways in which you can identify forms? cones and spheres are examples of (dark/artifical/geometric) forms, whereas mountains and trees are (natural/organic/light) forms.

Imagine that your friend comes to you interested in a career in the photography field but unsure if he wants to be an actual photographer. because of your interest in photography, you agree to mentor and guide your friend as he makes this decision. you suggest that he may want to explore other careers in the art world, like being an art critic, an art historian, an art collector, an art gallery owner, or a philosopher of art (also known as an aesthetician). you know that your friend is detail-oriented and likes making lists and cataloging items. in order to your friend decide what career path to follow, you agree to do some research about each of these career fields. define the career in one sentence. what might a day-in-the-life look like for each of these careers? what two skills will he need to be successful in each of these careers? at the end of the email, suggest the career that you think will be the best fit for him, with his skills in mind.

What is similar about the two images below? a. both contain earthlike colors. b. both reduce items to basic geometric forms. c. they share a similar composition d. they were painted by the same artist.