A Loop on the Cord

I heard a soft whirring down by the bookshelf and couldn't resist checking it out! A loose black lamp cord was dangling in a wide, sweeping loop between two heavy hardcovers. Naturally, I couldn't just walk past an obvious roller-coaster track. I zipped along the baseboard, caught the low dip of the thick cable with my soles, and rode the momentum right around the arc! It dipped and swayed, bouncing me upward until I caught the rim of a metal bookend with both gloved hands. What a wild ride!