Adjust some galaxies in the early timeline and changes would appear downstream as if they were always there. For affected lifeforms, these structures (e.g. a smiley face or whathaveyou) would appear upon waking in the present morning to the data, yet when the affected search their memories, the structure would have always been there.

Unlikely configurations could be interpreted as communication from beings more advanced than typically imagined, or as cosmic engineering projects, or perhaps more likely, the shape of the universe is just different than previously imagined.