I consider myself a philosopher and not a theologian or biblical scholar by any means. I do have a bachelor’s degree in Religion–biblical studies so I do know how to exegete and perform proper hermeneutics. With that said, here’s a philosopher’s exegesis of Colossians 1.15-17.
He is the image of the invisible God, the firstborn of all creation. 16 For by Him all things were created, both in the heaves and on the earth,visible and invisible, whether thrones or dominions or rulers or authorities–all things have been created through Him and for Him. 17 He is before all things, and in Him all things hold together.
ὅς ἐστιν εἰκὼν τοῦ θεοῦ τοῦ ἀοράτου, πρωτότοκος πάσης κτίσεως, He is the image of the invisible God, the firstborn of all creation.
Let’s look at εικων (eikon, a likeness, literally statue. A fig. representation—image, nominative singular feminine). This is where we get the word ‘icon.’ (The second Gr. text provided is Westcott/Hort with Diacritics 1853 and Codex Sinaiticus).