1.5 is a Mobius strip (a one-sided loop) The words on it are from T.S. Eliot's "Four Quarters"
What we call the beginning is often the end
And to make an end is to make a beginning.
The end is where we start from
We shall not cease from exploration
And the end of all our exploring
Will be to arrive where we started
And know the place for the first time.
— T. S. Eliot