I put this together for no reason on particular except leisure enjoyment:
Neck extension. This enables the E-string to play lower without needing to resort to a 5-string bass.
Hungarian girl with bass. I don't know if it's an effect of the photo or not but it doesn't seem that the fingerboard is elevated away from the body the way a double bass should be. I don't know how it could be playable if this is the case. Moreover, the fingerboard is designed like a guitar.
Bass origami



Neck extension. This enables the E-string to play lower without needing to resort to a 5-string bass.

Hungarian girl with bass. I don't know if it's an effect of the photo or not but it doesn't seem that the fingerboard is elevated away from the body the way a double bass should be. I don't know how it could be playable if this is the case. Moreover, the fingerboard is designed like a guitar.

Bass origami