I am wondering how would you define the situation in which a teacher has written so higgledy piggledy that it seems to be very difficult to make a relationship between the board's contents.
Or how would you define a picture that you would have a hard time to understand it.
In both cases, I used to say: "I can't understand it........
- It's all over the map.
- It's a jumbled mess.
But, once, here in this forum in a thread I used these two idioms and whereas a native speaker who was going to answer my question could not understand either case "a" and "b", I thought maybe there is something wrong with these idioms or maybe I am mistaken about the English equivalent for the concept in my mind. That was why I decided to ask about it here.
I was wondering whether my offered idioms work here. If not, then please let me know what idiom / expression is normally used in everyday speech to define these cases?