Besides ordinary religious manipulation-tools the Egyptians were masters of using architecture for propaganda. In Egypt, most of all, architecture was used as a media to demonstrated power, whereas the Greek and Romans used other types of art, like statues, for political propaganda.
The pyramids, palaces, tombs became tools for power demonstrations. Paintings and carvings (like on obelisks) proved the might of the rulers.
All those signs of power were done to make people compare their ruling dynasty to gods and keep them politically silent, because religion was used for justifying mortal power. Marble, gold, jewelry and artists were the tools for those maneuvers. Whereas questions for the truth were not even asked or listened to.
Finally it was the masses who were used for propaganda, when they were not only forced to work as slaves on those signs of power but also were abused for those power demonstrations, when they had to accompany the dead king into his tomb - dying of hunger, thirst, lack of oxygen and in darkness. The more religious disinformation the more luxury. The more luxury the better. The more luxury the more power.
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The retouch is the simplest way to change a picture. Small corrections can be made through this way.
A well-known example is the correction of a picture from a Bill Clinton-visit in Germany. In the background of the photograph stood some people, holding a sign with critical comments. In some newspapers the picture was printed like this, in others a retouch had erased the sign.
Another example happened in Austria in 1999:
The right wing party FPÖ had a poster for the Parliamentarian elections which said: 1999 reasons to vote for Haider. Others answered by producing a retouch saying: 1938 reasons to not vote for Haider (pointing to the year 1939, when the vast majority of the Austrians voted for the "Anschluss" to Germany).
The blue box-system works with a special blue colored background. The person in front can act as if he/she was filmed anywhere, also in the middle of a war.