i don't know if it's a second hand reference or a direct reference to experiencing a psychadelic trip and its visuals but yes - OP either heard that psychodelic trips can bring you interesting revelations or has experienced it themselves, and fractals are an almost universal psychadelic visual, hence the image
regarding the logos bit - have you never had a profound realisation that happened so quickly in your brain and on the level of pure emotion (instead of words) that you then needed significantly more time than it took you to think that realisation to actually verbalise what you felt/thought/experienced?
to lead with the most extreme example: ego death, if you take enough psychedelics and are able to let go, you might experience the death of your ego. It's simply impossible to describe with any mortal tongue, but i'll try to paint a picture of how it feels. At some point in your trip, long after time lost meaning, you find yourself- gone. There's sort of like and- echo, at the back of your mind, a faint whisper that is you, you aren't really there anymore. If you let go of the last strand of what's left of you, you'll find your mind dissolving altogether and a very specific and universal feeling will occur: you'll feel, for a short while, or maybe multiple hours, again time has lost all meaning, that you're part of the universe, and you'll understand that you are the universe, a part of it, but also all of it in a way, the universe experiences ourselves through all of us, and we are one, seperate only in the way that mushrooms appear to only be the bits that we can eat.
^and this is to say, trips like that are prime examples of experiencing the purest of logos, understanding, on an innate level, a truth about the world and feeling it change you and your perspective on the world,,, and at the same time being completely unable to do it any justice when you try to describe it, because usually it's very hard and sometimes it's downright impossible