Frank Lloyd Wright’s Hollyhock House drew design inspiration from a flower. Now the house and Barnsdall Art Park are about to get bathed in swirling colors and shapes inspired by a hallucinatory plant: ayahuasca. Artist Aaron Axelrod explains his pop-up installation, “Dark Matter,” which will cover the house and park in projection-mapped video, neon-lit mixed-media art and a painting encrusted with crystals.