Runes of mana

The feeling of the unknown, what does it mean? Is it a lack of knowledge about something or is it something that hasn't even been thought about existing? So in fact, unknown means that something is just not there, there is no knowledge about that thing and even if you think about it, you can't. Because it's completely not there. How can something be unknown if you know it? Seems like a weird thing to say or even think about because it's more like a paradox. But when you think about it, it is still right but weird. I have no clue why I even think about things such as this. Now is the moment to create a rune on something. There is a plank laying on the ground. This one was very light and dry. I wonder…