These formations roughly trace the outline of each machine.

He used the camera's viewfinder to trace an outline of the area into which the actors would later be inserted onto the glass.

To prove his point, he spreads the table with graphs, tracing the outlines with his fingertip.

Using special drone-mounted cameras, scientists have traced the outline of the ship in the mudflats.

Print it out and trace their outlines and faces onto thick paper by pressing your paper over the photo against a window.