Watch the two bars cross the striped road and decide which one looks faster. Their positions and speed always match, but changing edge contrast in this optical illusion can make each bar seem to stop and step forward in turn.
Music: "The Voices" by Kevin MacLeod (incompetech.com), licensed CC BY 3.0 US. Excerpt trimmed to 30 seconds and mixed with this video.
Source: https://commons.wikimedia.org/wiki/File:The_Voices_(MacLeod,_Kevin)_(ISRC_USUAN1100046).oga
License: https://creativecommons.org/licenses/by/3.0/us/deed.en