Victor Reijs

The 'walk' starts from the double Spiral (spinning someone before doing something happens also in other instances: like games. Agitating the inner ear: BPPV: http://www.ehow.com/about_5... ) and ending with the path that widens towards the Mound (goal?) (the perspective makes perceiving the width of the path as constant).

The labyrinth is some 4.4 km long, so in reality it would take some 50 minutes to walk it (so some 10 times longer than in this simulation).

I don't think drug induced stimuli would have been used; otherwise how to stick to the 1.1 m width?
Another option: I do think the path is wide enough to stay alive: if there would be a penalty of death when transgressing the path border.
The spiral walking can make someone somewhat dizzy, but perhaps more at night than during the day...
Or it might have been a symbolic labyrinth.

Based on idea of C. Ruggles and N.L. Saunders expressed in the article "Desert labyrinth: lines, landscape and meaning at Nazca, Peru", Antiquity 86 (2012), pp 1126-1140: http://antiquity.ac.uk/ant/... and http://www2.cliveruggles.co... . And I am using 'in fair scientific use' the drawing of the labyrinth's path (Figure 2, made by Deborah Miles-Williams). It is slightly adjusted: height lines removed; 'dots' are joined; and path is made light brown instead of black.