3D image of the circumstellar medium around an LBV + O binary, after one orbital period (1 yr). The slice along the equatorial plane shows the logarithm of the density. An isosurface along which the absolute velocity equals 300 km s^-1 is representative of conditions along the contact discontinuity between the shocked LBV wind and the shocked O-star wind. N.B. the z-axis has been stretched by a factor of 2 highlight the 3D nature of the instabilities.