First of all, sorry if this question is off-topic - I have looked at the help section and I believe this falls into the "techniques and best practices" category, and similar questions have been asked before, but I'm still open to suggestions about editing, moving or closing this question.
My wife loves macrophotography and can often be found alone, lying on her stomach in a field of grass or in a forest taking pictures of a flower, mushroom or insect for hours without any noticeable movement. This is fine and well, but sometimes one or more random passersby come up to check up on her: to see if she requires medical assistance.
She is already used to this and just tells them she's okay, but still feels bad for needlessly worrying those people, not to mention that the next time they see someone lying still, the same people might not check up on someone who is in genuine distress.
What would be the best way to let laypeople know that the motionless, prone person is, in fact, taking pictures and needs no assistance? Preferably this method would
- work from a distance and
- not involve lugging around and setting up heavy or bulky equipment (like a meter-wide banner saying "TAKING PICTURES"),
- nor involve sounds or movement that might scare away the animal being photographed (mouse, bird, insect, etc.).