I thought they denote a tree structure. At least that's how I remember it being in Scheme. You could follow the order of evaluation back to the root node. Somet

I thought they denote a tree structure. At least that's how I remember it being in Scheme. You could follow the order of evaluation back to the root node. Something I wish was explained earlier, because initially I found all the parentheses confusing as Scheme was my intro to programming language.