Quantum experiments that reveal interference fringes are often cited as evidence of a fundamental wave process․ However‚ an alternative explanation is possible‚ based on a quantum rule introduced by William Duane in 1923 and expanded in 1926․ Although his rule appeared to conflict with the then-emerging wavefunction theory‚ Carolyne Van Vliet later demonstrated in papers published in 1967 and 2010 that Duane's rule can be derived directly from quantum theory by modelling the slit screen as undergoing a distributed‚ quantised change in its linear momentum upon particle interaction․ This VR world presents particle simulations‚ based on Van Vliet's work‚ alongside wave diffraction simulations to contrast the two approaches․