Hit the wrong lift door button when in a hurry. Maybe closing the doors on someone hurrying to hop on.
It's not hard. The Australian Standard symbology is confusing as it depicts door states in conflict: one shows the desired state of the door being closed: the arrow heads pointing to the door leaves closed, suggested by a vertical line; but the other shows not the desired state, but the current state: another vertical arrow, but not the state we want for the doors open. At a glance they are impossible to distinguish promptly.
A better symbology is in the lifts at a Council Chambers I recently visited in Sydney.
And here's my sketch.
In fact, the current lift button design would be much improved if the vertical bar between the tiny triangles was removed on the 'door open' button.
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