BPMN2 — The Two Multi-Instance Markers should be reversed

The two versions of the Multi-Instance loop marker should be reversed. The three horizontal lines looks more like parallism and the three vertical lines look more like sequentialism.

Reason: Changing the icon for multi-instance activities now will cause a lot of confusions. It will be difficult to ensure that the whole document stays in a consistent state.
There are also already publications out on the market that use the current notation.
Even for BPMN 1.x there are examples that use the current "vertical" notation for parallel, e.g. see Steves
http://www.bpmn.org/Documents/Notations_and_Workflow_Patterns.pdf , Figure 30. So, there would be some kind of incompatibility introduced.
Which orientation is better to understand for parallel and sequential depends mainly on taste on which axis one assumes time. If you model vertically top to bottom, the
current notation is good. This is similar like writing a text, or also similar to UML activity and sequence diagrams. Only for the case that you model left-to-right the other
proposal might make little more sense.
Conclusion: Changing the meaning now has much higher risk than advantages.
Disposition: Closed, No Change