Why do artists do not sign their work?

[Amateur]

Сообщение от vyadem

I know many people who immediately raises the question of "why it was impossible to leave the autograph on the work itself? ... The back and I can write"

Updated: while some are not shy in front of the artist and sign (see example above). Here, dear artists, what can result nepodpisyvanie your work! It turns out that her and for the work of another can give.

Сообщение от DSF

I often do not put a signature, simply because I do not find place for it. Signature - a color stain, which can disrupt the existing system. Theoretically, the signature must be planned in advance, in practice it is not always possible.

And why in this case did not sign at the edge, which then still leave a frame? Current system is not broken. After all, perhaps, when planning songs artists take into account that part of the picture plane, in any case will not be visible due to the frame.