This study concerns children's understanding of spatial relationships and their expression in drawings and photographs. Sixty children (ages 5, 8, and 11) were asked to discriminate and reproduce three types of depth relationships in either drawings or photographs: enclosure, where a larger object is placed directly behind a smaller object; occlusion, where one object is placed in front of and partially obscuring another object; and perspective, where two objects are completely in view but one object is placed behind and at a distance from the other. The findings indicate that reproduction is more difficult than discrimination in both media. When reproducing the depth relationships, overall, it was more difficult to reproduce them in photographs than in drawings. However, certain depth relationships are more easily reproduced in photographs, while others are more easily reproduced in drawings. The results are discussed in terms of how the characteristics of the medium access different aspects of conceptual understanding. (Author/PN)