A Mobius strip has only one side… if you trace your finger along it, you will come back to the starting point! I took advantage of this concept by stamping a musical round on one.
“Row, row, row your boat, gently down the stream… merrily, merrily, merrily, merrily, life is but a dream…” and you’re back at “Row, row, row…” $80.
Tullia's Jewels 