Located in the grid are four phrases pictographically represented with "over" or "under", surrounding the four horizontal black square strips in the grid. These fit into the blanks at the bottom of the puzzle (in alphabetical order).
FLEW UNDER THE RADARS
HEAD OVER HEELS
LIVE UNDER A ROCK
WOOL OVER MY EYES
Taking the numbered blanks in order spells ANSWER USE A MIDDLE ROAD, so the answer is USE A MIDDLE ROAD.