movie1 Coupled wake/base pressure dynamics of a natural wake reversal. Left : streamwise velocity field ux in the plane z/H = 0.67. The recirculation region is indicated inside the white contour ux = 0 and the red cross denotes the position of the center of wake momentum deficit. Right : evolution of the lateral position of the base CoP yb with time in convection time units. The red dot indicates the current timing. movie2 Hydrogen bubble flow visualization of the Ahmed body wake at ReH = 9000 in the vertical plane of symmetry y/H = 0. The recirculating flow coming from the bottom shear-layer is triggering the top shear-layer near the base to form large-scale structures of characteristic time-scale StH = 1.