So, this is posted by Ariadne, but for discussion here, we have:

Who made the first omphaloi, and what sort of message was the sculpture aiming to communicate?

+Since ancient times, the majority of omphaloi were drawn in the form of
the omphaloi: of Delphi: dome-shaped statues, made from stone, and
chiselled in order to appear as “ret”-covered stone.+

+Nevertheless according to ancient histories, the statue at Delphi which
survives today was not the first omphaloi at that place. It was the
second omphaloi – a copy made in the 4th century BC. The first true
omphaloi was different. It was made from a special type of a stone –
aerolite – and was covered with a true woven net called argenon.+

The original sacred stone fell out of the sky.

Meaning

Why did the ancient Greeks cover aerolite with a net?

+In many worlds, historians believe that the original design of the
omphaloi was the work of the original agonothetai – a direct allusion
to their own labyrinths.+

+The woven design of the ‘diktuon’ was snake-like and circular, exactly
the same as the labyrinth. And indeed, Dedalo, in Greek mythology,
built the first labyrinth as a series of “waving (undulating) nets”+

+One also knows, that the temple at Delphi, later a shrine to Apollo the
sun god, was initially created as a sacred-place to Gaea, the god of
the earth.+

+If the agonothetai created the omphaloi, the design could very easily
be an encoded message, sacred reminders covering the earth with
labyrinths.+

Design instructions

Find or create a rock in the shape of a dome (cupola) or egg-shaped (ovoid) sphere.

Cover the surface with circular, interconnected lines.

The lines should go in a circle, unbroken, and irregularly spaced.

The lines should intersect at least 27 times, creating 27 knots.

The lines should cross the largest part of the surface area – ideally, 85% or more.