Fig. 3

Change of geographic scale at a single position within a virtual maze. Left: ground perspective (4.5 ft./1.4 m above ground); the blue flag was the only visible landmark. Right: elevated perspective (17.5 ft./5.3 m above ground); both the blue flag and Big Ben could be seen from a single viewpoint. The spatial extent visually accessible from a single viewpoint was controlled by hedges along both sides of the path