The traditional understanding of the double-slit experiment, which serves as a classicdemonstration of wave-particle duality, is being reconsidered due to new insights into therole of the central barrier between the slits. Contrary to the expectation of seeing twostripes on the screen when treating light as particles, the pattern can be more complex.This complexity arises from the interaction of light with the central barrier, where it isabsorbed and re-emitted in the form of surface plasma polaritons (SPPs). These SPPs travelalong the barrier's surface and contribute to the observed interference pattern. If theirprogress is interrupted by a Geiger counter, the pattern is altered, suggesting that theparticle nature of light alone can sufficiently explain the phenomena. This challenges thetraditional wave-particle duality interpretation and calls for a more nuanced understandingof quantum behavior.