An ensemble of trajectories for the two-slit experiment, uniform in the slits. De Broglie showed in detail how the motion of a particle, passing through just one of two holes in screen, could be influenced by waves propagating through both holes. And so influenced that the particle does not go where the waves cancel out, but is attracted to where they cooperate. This idea seems to me so natural and simple, to resolve the wave-particle dilemma in such a clear and ordinary way, that it is a great mystery to me that it was so generally ignored. Nonetheless, it would appear that inasmuch as orthodox quantum theory supplies us with probabilities not merely for positions but for a huge class of quantum observables, it is a much richer theory than Bohmian mechanics, which seems exclusively concerned with positions.
Appearances are, however, misleading.
It is a great merit of the de Broglie-Bohm picture to force us to consider this fact.