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We experimentally demonstrate coherent control of two light filaments in air generated by ultrafast laser pulses, as proposed by Xi et al. [Phys. Rev. Lett. 96, 025003 (2006)]. We show that depending on the relative phase and the incidence angle, the filaments can experience fusion, repulsion, energy redistribution, and spiral motion for propagation in air. By translating the initial beams on subwavelength scales, we achieve ∼1-mm transverse deflection of approximately 0.5-mJ energy fordoi:10.1103/physreva.81.061803 fatcat:643m7irsp5bt7ha2gdudvweg3i