Khaire Apollon, Om Namah Shivaya.
Apollon has often been presented in a column type form. Apollon as Karneios through many Doric areas as attested by Pausanias has been little more in representation than a column with the head of the god upon it in some semblance to the herm. In Amyclae, one of the Spartan villages, Apollon Amyclaeus was represented, although in full form body, in a shape and form reminiscent of an upright column on his throne with spear in one hand and bow in the other. And yet more notably has been the presentation of Apollon Agyieus in Greece and throughout the Roman empire (the latter part I was not aware of until recently where realization of Apollo presented in Agyieus form on the Palatine hill was known to me for a while, that a friend revealed these similar images throughout the Roman Empire in various places), the great column of Apollon, upraised and garlanded, sometimes depicted with sacred symbols of the god, sometimes not. But otherwise the meaning behind it appears rather ambiguous.
I have for at time connected it a northern pillar, likening to the reference of the pillar of Koios (the maternal grandfather of Apollon, the axis of the heavens, and upon whose pillar Leto hung the bow and quivery of Apollon. As a heir of Koios, we find the resemblance perhaps in the column of Apollon, the nature of perhaps Phanes who erected to the column dividing forth the elements, so Koios’ column pins forth the heavens (Ouranos) in the center while his brothers pin him at the sides in their contract with Kronos. Apollon himself is his most primary form is the column of the north for which his holy sanctuaries were orientated to face the north, and his most sacred garden rested in the north. The column is the upright one, the pinnacle of all the winds and all the direction coming together. A pillar of light that raises like a great torch that illuminates all corners of all things to the depths of and heights.
Thus too we find Apollon in Siva this same manner. For the column form of the lingam is represented to be the unmanifested form of Siva as a column, for which in the winter a great festival honors him with a column of light in the form of a big bonfire. In the contest between Brahma and Vishnu in which we find Siva appears occurs around a column of light and to them Siva challenges them to find the top of the column which is endless and is itself Siva. Although the sacred stones used to for the lingam are not particularly visually reminiscent of light, there are many temples that use other stones for the lingam, and one temple in particular in Hawaii I believe has its aim to acquire a giant quartz naturally occurring lingam that was found in the USA (if they have not already acquired it as that may have been an old article I have)
Typically the column of Siva and Apollon were black in color, the natural lingam stones from the holy river are in rare form black, but more commonly they are grey with a red marking at the head of it. There are no modern representation of Agyieus stone that have continued to generationally be used. Certainly the lingam can double as the Agyieus stone and the lingam of Siva if you choose to orientate your shrine at the doorway to double function. In my case I have both the lingam, in the center of my household, and another pillar of quartz by the doorway currently (until I find something that suites better) at the doorway as I choose to not set my shrine up by the doorway where I already have a doorway shrine that is utilized by all the doorway gods. But when I am offering at either of these I am offering with both Apollon and Siva in mind for I see this oneness between them symbolically attested more strongly than in any other cultural representations. The stone with the great serpent coils around, not too different from the Omphalos stone that was regurgitated by Kronos and marked the center of the earth as much as the axis of Koios marked the center of the heavens and the eye of the great heavenly dragon.
The holy column is of paramount, the holy column is adorned with sacred garlands and leaves. The holy column has no true end or beginning, a column of fire upon which the sacred waters are libated which rises too from the sacred seas and earth. It is the center of adorations for every household, and giving honor provides securities for the household and the continuation of the household with husbands and wives for the children of the household and the promise of continuing generation for the column is inseparable from the yoni base whether you see this base as being a place of Hekate being worshiped as stated in some interpretations of the Agyieus stone (although it seems more likely to be for Artemis given the popular household cult images of Apollon with his bow and arrow and his twin beside him with torch and bow), or Siva and Sakti/Parvati. They bestow their blessings upon the sons and daughters of the household, upon the householder and wife. The give protection and generation to the household.
No other representation is needed (although I love various representations, collecting them and making them to surround me with the presence of my gods in their beauty) of Apollon-Siva, and is the most basic and common necessity for the household to honor the god.
Khaire Apollon. Khaire Artemis. Om Namah Sivaya. Om Sri Gauri Namah.