Task: Set up a still-life arrangement with any object. Position a lamp overhead, pointing down. Take 2 photos: 1. naked lamp; 2. using a diffuser.
Without a diffuser there was a greater amount of contrast with darker shadows, whereas using a diffuser created a softer, graduated shadow underneath the elephant. I can see how as a photographer I will need to consider what effect I want to produce. No diffuser will create stronger contrasts, emphasizing relief and shape.