We theoretically investigate the illusion device designed by a conformal transformation that can render an elliptic defect behave like a flat mirror.Different from illusion devices consisting of the complementary medium and anti-object with negative permittivity and permeability, our proposed illusion device requires only Bedlinen isotropic positive permittivity medium.It offers a possible route to eliminate the lateral shift in the Powder Exfoliator conventional quasi-conformal carpet cloak.Interestingly, with the same conformal transformation, we can achieve an impedance-matched flat absorber by simply varying the shape and the refractive index of the defects.Both the illumination device and the absorber in our design have broad bandwidth, wide-illumination range and polarization-insensitive performance.