Permutation with 4 basic colors, center black
Permutation at the edge with red, green, blue and yellow (without black and white)
ID=08 Version=83, Permutation #01
Image width in cm: (50 / 100 / 120 / 150)
==> rectangle width in mm: (125.0 / 250.0 / 300.0 / 375.0)
With 4 colors there are 4! = 4 * 3 * 2 * 1 = 24 possibilities of arrangement. By rotating 90 degrees (4x) you will not get a new motif. Therefore the number must be divided by 4.
So you only get 4! / 4 = 3 * 2 = 6 possible combinations.
If the color in the center is varied, 5 different colors in the center (red, green, blue, yellow, black and white) give 6 * 6 = 36 possible combinations. If the color white is added to the edge, there are even more possible combinations. For the time being, this will be waived.
For the time being only black in the center.
Other combinations can be created on request and upon request.
Note:
D in the title means Dark, because B for Black is already taken because of B for Blue.
Further abbreviations:
R: Red / Red
G: Green / Green
B: Blue / Blue
Y: Yellow / Yellow
                                
 
                                
                                        I deal with constructive graphics.
I am probably one of many unknown pioneers of computer graphics. Graphics with a "ph",  I insist.
Already at school my student work was constructive. The work afterwards was mainly with ink,  ruler and compass. Only for a short time I had also constructed with..
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4xL | N=20 | V=48 | 02x02Gerhard Haberern 4xL | N=20 | V=49 | 02x02Gerhard Haberern
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4xL | N=20 | V=50 | 02x02Gerhard Haberern ID=1:1-10-39 | V=048-04Gerhard Haberern
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ID=1:1-10-39 | V=048-06Gerhard Haberern