A slit or opening in an external wall of a building. Cf. loop-hole n.1 1a, 2.
“dream-hole, n.” OED Online. Oxford University Press, September 2016. Web. 20 September 2016.
I just got Clip Studio Paint EX and started playing with it. It’s much easier to use than Illustrator for simple drawings and I think I can get much better results than Art Rage. It looks quite simple but I’m still trying to figure a bunch of things out.