Now have strange lines in multi color on a square on desk top, and above Safari and other doc icons.  What to do?

Now have strange multi color lines on a 2 inch square on desk top.  Also above some of Doc apps. Why?
and how to get rid of them?

A Safe Mode boot help ...
Startup your Mac in Safe Mode
A Safe Mode boot takes much longer than a normal boot so be patient.
Once you are in Safe Mode, click Restart from the Apple () menu.
Then see if the lines / square is gone.

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