Indentation is implicit, because you can't see the characters that cause it without turning on whitespace rendering. You only can tell it's there by either mov

Indentation is implicit, because you can't see the characters that cause it without turning on whitespace rendering. You only can tell it's there by either moving the cursor around or by observing gaps between characters and other characters or characters and the left margin. And the end of a block, the lack of indentation that denotes that, is absolutely implicit.