The anisotropy of the induced current density (AICD) is an intuitive and visual tool for studying electron delocalization of molecules in terms of magnetically induced currents. Study on the AICD of C 16 shows that it has induced currents distributed on the inner/outer edges (i.e., π in electrons) and the upper/lower sides (i.e., π out electrons) of the ring, indicating that it is indeed a double π-conjugated system (Figure ). Both π in and π out electrons of C 16 in S 0 state form obvious paratropic ring currents, which are contrary to the left-hand rule upon the direction of the external magnetic field (Figure ). This provides strong evidence for the distinctive double anti-aromaticity of C 16 in the ground state. In stark contrast, the induced currents generated by π in and π out electrons in T 1 and Q 1 states exist diatropic feature satisfying the left-hand rule, implying that the excited-state C 16 ring should be aromatic (Figures ) and 2(c)). The evidently wider and smoother AICD isosurface of the Q 1 state compared to that of the T 1 state reflects the significantly more aromaticity of the former. The results of AICD analysis for C 16 are in good compliance with the Hückel's and Baird's rules for the prediction of molecular aromaticity, and are also consistent with the above conclusions from atomic force and NICS analyses for different electronic states. In order to visualize the pathway of induced ring current, we also generated animations via the GIMIC code showing them in the Supporting Information, which intuitively display the dynamics of the induced current in the three electronic states of C 16 .