OK, on this video the effect is very tiny but ... it is here ! Or what do you think ?
<p><br>
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.
</p><p>For specific values of amplitude and frequencies, the droplet start to move forward by itself : while bouncing, it create waves with which it interacts.
</p>
This object has been called a walker, and exhibits properties reminiscent of an elementary particle, because it is at the same time a particle (the droplet) and a wave (The local standing wave pattern created by the droplet)
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<bdo lang="en" dir="ltr"><a href="//commons.wikimedia.org/wiki/Commons:YouTube_files" title="Commons:YouTube files">YouTube</a>: <a rel="nofollow" class="external text" href="https://www.youtube.com/watch?v=nsaUX48t0w8"><bdi lang="">Single particle creates interference after double slit - Wave particle duality at the workshop</bdi></a> – View/save archived versions on <a rel="nofollow" class="external text" href="https://web.archive.org/web/*/https://www.youtube.com/watch?v=nsaUX48t0w8">archive.org</a> and <a rel="nofollow" class="external text" href="https://archive.today/https://www.youtube.com/watch?v=nsaUX48t0w8">archive.today</a></bdo>