Magnetic field orientations inferred from submillimetre emission and visible or NIR extinction polarization observations towards the Taurus (top left), Pipe (top right), Lupus I (bottom left), and Musca (bottom right) molecular clouds. The colors represent the total gas column density in logarithmic scale. The drapery pattern, produced using the line integral convolution (LIC, Cabral & Leedom 1993), indicates the magnetic field orientation, orthogonal to the orientation of the submillimetre polarization. The black pseudo-vectors indicate the magnetic field orientation from starlight polarization in the corresponding lines-of-sight. Each pseudo-vector represents the average field orientation inferred from the stars within 3.́5-diameter vicinities.