We explored the hypothesis that the restorative value of a place is affected by the structural properties, i.e. a common quality not represented by the built or natural content. The visual structure of natural patterns inherently possess self similarity between scales, which can be measured with the fractal dimension, D. Fractal properties can been found also in some, built environments. Color photos and their extracted silhouette outlines from three types of environments were considered: natural restorative, built nonrestorative, and built restorative. The relationship between rated restorativeness, preference and D was analyzed. Results show a high correlation between photo preference and photo restorativeness, and significant correlation between photo preference and silhouette preference The relationship between restorativeness and silhouette D is less clear. Like in previous studies, D seems not to have a linear relationship with the other variables.