This puzzle is part of the Monthly Topic Challenge #14: Think inside the (very small) box!.
What is in the middle space?
Hint:
The answer can be easily "read off" without computer assistance or special knowledge.
However, for the diehard puzzling enthusiasts, yes there is an optional secret message/hint hidden in the pixel ornamentation (THE extra dots and bars on the tAll nodes).
Hint 2:
Although the question only asks about the middle one, each space holds a word. There is no cipher used, unless you are looking for a very helpful hint, in which case you should consult Samuel.
Hint 3:
Seem hard? Reread everything. The way forward is hiding in plain sight. Also, web adventurer had the right idea to count things but I am not sure why they only counted some of the nodes.