A figure or a number sequence is logical,
if all its components follow identical criteria.
Look at the following two pictures:
View attachment 1160319
Both have 19 pieces. That's a consistent logic.
The right picture contains no logic by itself.
On the contrary, the left picture is strictly logical: It contains
two axial planes: On both sides of the two blue lines is mirror-image the same.
Now look at your figure:
View attachment 1160317
Your figure contains no logic:
1.) Your figure contains only 17 tiles.
One stone is missing and one is next to the figure.
2) Your figure is not logical in anything.
It is not symmetrical in anything
Your figure would have an axial plane, if
1. the stone outside the figure would be in the correct place
2. the missing 19 stone was in the correct place.
3. The figure is not in the center of the free space
The figure must be placed as much as possible in the center of the picture.
so that there is the same amount of free space all around, above, below, left, right.
In contrast to my figure, yours is very easy to create.
Move your figure one down and one to the right.
Then it is almost as difficult to create as mine.
See here how your figure is correctly in place :
View attachment 1160318
