Single particle creates interference after double slit - Wave particle duality at the workshop

A bath of silicon oil is vibrated and oil droplets are deposited on the surface. Thanks to the vibrations, the droplets do not coalesce, but bounce on the surface. For specific values of amplitude and frequencies, the droplet start to move forward by itself : while bouncing, it create waves with which it interacts. This object has been called a walker, and exhibits properties reminiscent of an elementary particle, beca