SUMMARY :

The author, G. CHARRIERE-GRILLON, bases his study on the hypothesis settled with L. BOUTIER in 1991 about the Nasca Lines. Here, he clarifies and develops it.

According to them, these Lines are drawn by an enlarging perspective of 3 dimensions naturalist designs built with golden wires made of large geometric strips. In fact, this perspective, as the opposite of the classic pictorial one, is a conical projection. So with angle deformation and slanted line on the floor, it represents some beaks, heads, necks, crops, or wings of local birds. These representations on the pampas desert are sometimes so exaggerated or deformed than they cannot be easily recognized from the original 3 dimension scale-models.

Another proof can be provided. These naturalist geoglyphs are drawn by a continuous uncut line although sometimes it crosses itself because it results from the projection of a wire, which describes some convolutions by following the morphology of 3 dimension small golden motifs.

This is an enlarging perspective because the object to be drawn, located between the eye and the far projection plane, is see-through and totally open-work  as a filigree created with opaque material saving structure.

Moreover, the line on the floor becomes wider as the drawn megapicture size rises because the projection increases the enlarged wire diameter. But to achieve this perspective, any binocular view must be avoided, because the superposition of the 2 different pictures provided by each eye, creates an image in relief which blurs the projection. Guided from a far highly located point, this projection is built by "stickers" positioning stakes into the pampas according to the instructions given by runners. So a special binocular vision mask, like the Nasca instrument called " Brooklyn’s mask ", is very useful for the operator to prevent him from superposing the 2 different pictures given by his eyes and sensing the reverberation effects.

Geometric and naturalist geoglyphs, or the simplest ones as made with a stencil, are all enlarged by the same method from golden strips, wires and openwork sheets.

In this paper, G. CHARRIERE-GRILLON develops his own conclusions about a global conception of the Nasca Lines. He worked for this purpose on the Reiche, Aveni or Clarkson’s studies or these other specialists or clever amateurs ones.