Taking a look at wave-particle duality form the alternative view that the wave-particle is both a wave and a particle at the same time, not the two traits in superposition. In this speculation, photons and other particles are described as wave-particles that can display both their wave and their particle nature at the same time. Yikes, I know. I am characterizing the photon wave-particle to have the particle portion (dense wave energy core) at the center of the particle space, surrounded by the wave portion which is a spherically out flow of wave energy form the dense core. This particle structure applies to particles that cause a wave interference pattern in single particle two slit experiments, including the delayed choice quantum erasure experiments like: https://en.wikipedia.org/wiki/Delayed_choice_quantum_eraser#The_experiment_of_Kim_et_al._.282000.29 This particular particle structure, if the speculation is true, makes understanding what is going on in the single particle two slit experiment a simple matter of the wave portion going through both slits, and interfering with the path of the core portion which goes through one or the other of the two slits. Some may think I am talking pilot wave theory, but I'm not and may differentiate between the two later. It also demystifies the delayed choice quantum erasure experiment, because it means that there will always be an interference pattern developed after multiple single particles are sent through, if there is a path to that detector from both slits, as is the case with D1 and D2 in this image of the setup: https://en.m.wikipedia.org/wiki/File:Kim_EtAl_Quantum_Eraser.svg The article pointed out the there is always an interference pattern at D1 and D2, but never at D3 and D4. Isn't the reason for that simple, if the photon is a wave-particle, i.e., a wave and a particle at the same time, as I speculate? Here's the Kim et al team comment: If an idler photon is recorded at detector D3, it can only have come from slit B. If an idler photon is recorded at detector D4, it can only have come from slit A. If an idler photon is detected at detector D1 or D2, it might have come from slit A or slit B. Wouldn't you always get an interference pattern on the screen if the particle portion of the wave-particle went through either A or B, but the wave portion of the wave particle went through both A and B, creating the interference? In the Kim et al. setup, that is exactly what the red and the blue paths show; if you have a red and blue path to the detector, you get interference on the screen pattern because you have wave energy reaching both D1 and D2 from each slit. You get no interference on D3 and D4 because those detectors never get wave energy from both slits, they always only get the wave energy that comes through the same slit as the particle comes through. The wave-particle is both a wave and a particle at the same time, and that explains how a single particle two slit experiment can produce the wave interference pattern on the detector screen.