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AN EXPLANATION OF rxtraman.gif
I did not create this GIF, nor do I know who the creator is  if the author should happen to see this, or someone knows who the creator is, please send me an email so I can give proper credit  one clue to the originator is is that the filename is 'rxtraman.gif'  the other is an internal file comment "Built with GIF Movie Gear 2.6"
This is a very clever puzzle and it took me a while to figure it out  and even longer to explain it 
First the puzzle  this is an animated gif



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rxtraman.gif  Animated


Count the people  after it moves, count them again  it shifts between 12 and 13 


Twelve person picture

Thirteen person picture

Where did the extra person come from?

This is the 12 person picture with 13 numbered positions

For ease of discussion. let's say all the people are 65 inches tall and share equally, that is they each give up 5 inches of their height
In English, 60 inches of person 2 is moved into position 1  that leaves 5 inches of person 2 in position 2 (the bottom part of their shoes) 
55 inches of person 3 is moved to position 2, which combined with 5 inches of person 2 places a 60 inch person in position 2 and leaves 10 inches of person 3 in position 3 (the bottom part of thier shoes also)
50 inches of person 4 is moved to position 3, which combined with 10 inches of person 3 places another 60 inch person in position 3 and leaves 15 inches of person 4 in position 4 (their entire shoes)
45 inches of person 5 is moved to position 4, which combined with 15 inches of person 4 places another 60 inch person in position 4 and leaves 20 inches of person 5 in position 5 (their shoes and part of their legs)
Etcetera
5 inches of person 13 is moved to position 12, which combined with 55 inches of person 12 places another 60 inch person in position 12 and leaves a 60 inch person in position 13 (everything remains except a tuft of hair)
The table details all the moves
Position


Plus


Position

Remainder

1

60 inches of person 2



2

5 inches of person 2

2

55 inches of person 3

5 inches of person 2


3

10 inches of person 3

3

50 inches of person 4

10 inches of person 3


4

15 inches of person 4

4

45 inches of person 5

15 inches of person 4


5

20 inches of person 5

5

40 inches of person 6

20 inches of person 5


6

25 inches of person 6

6

35 inches of person 7

25 inches of person 6


7

30 inches of person 7

7

30 inches of person 8

30 inches of person 7


8

35 inches of person 8

8

25 inches of person 9

35 inches of person 8


9

40 inches of person 9

9

20 inches of person 10

40 inches of person 9


10

45 inches of person 10

10

15 inches of person 11

45 inches of person 10


11

50 inches of person 11

11

10 inches of person 12

50 inches of person 11


12

55 inches of person 12

12

5 inches of person 13

55 inches of person 12


13

60 inches of person 13

13


60 inches of person 13





One of the cleverest substitutions is the number 10 position (2nd from the right)  this position 'gives up' almost the entire head, a few chin pixels remain  when the partial light blue head from position 11 moves over the previous chin pixels become the nose and the open neck of the tshirt form the rest of the head 

Explanation GIF  Animated


Said another way, there are 12  65 inch people or 780 inches of people  after the switch, there are 13  60 inch people or 780 inches of people  in this case all were not the same height to start and all did not become shorter by the same amount  however, all the people are shorter in the 13 person picture  many are quite noticably shorter in the explanation gif as it 'flips'

Substitution Order GIF  Animated

My PSP techniques aren't that good, but I've tried to retain the original figures as best I could and arranged them in substition order  this animation just slides the top half of the graphic over to the right and back again 
Hopefully I've done it good enough that you can see, for example, how the magenta person in position 6 becomes a shorter magenta and blue person here and in the explanation gif above 
In the description I assumed they were all 65 inches high and gave up the same amount, 5 inches  here you can also see that the actual amount 'given up' varies  position 2 and 3 leave behind just a bit of their shoes  position 5 leaves behind most of the legs and below  position 6 leaves behind most of the shorts and below  and so on  position 13 leaves it all behind except a tuft of hair 