What the ... ?

I found a school textbook my brother, who is sixty-two, had in sixth grade. While leafing through it, this small piece of paper turned up. It's my work, and I would have done this when I was around fourteen or so, years after my brother, who is older than I, would have used this book. I know I'd never read the book, so how it ended up there is a mystery. A greater mystery, though, is what on earth I was trying to convey with these doodles. It was forty-five years ago and I have no recollection at all of doing them.