Originally Posted by blackmonsters

Yeah, you missed the part where the top end of the flag folded over causing the
red on the reverse side to cover the front diagonal blue-stars stripe and the reverse side
diagonal blue-stars stripe is now showing in front instead.

Draw an "X" on both sides of a piece of paper like it was a two sided flag, then fold the corner over in a diagonal angle with the folded edge running parallel with the cross stroke of the "X".

It's sort of an IQ test.