I am spending the afternoon researching Michael Heizer's Double Negative. The most important information I've found is how to get there! By descending steep ramps at the ends of the trenches, visitors can enter a long, narrow lane that reveals a view across the ravine to the trench on the opposite side. Heizer stipulates that we should spent one whole day with the sculpture in order to understand it: to grasp its size, surfaces, spatial structure, and transformation in light and shadow…