An easel.
If the object is falling down, it is accelerating. "Inertial frames of reference" do not include acceleration, so the falling object can't be considered an inertial frame of reference, according to the Special Theory of Relativity. However, the General Theory or Relativity explores additional complications due to gravity. In any case, if you wish, you can use the object accelerating downward as a reference frame (just don't call it "inertial"); in this case, obviously the room is accelerating upward, compared to the falling object. It all depends what object you choose as your reference frame.
That technique is typically called the "cinemagraph." It combines elements of both a photo and a video, where part of the image is in motion while the rest remains static. It creates a captivating visual effect by highlighting specific movements within the frame.
You call it an OBSERVATION.
blood flow is called circulation
You would call it a permit or authorization document.
modern canvas as they call it is made of cotton
Typically, painting is done on a "canvas" which is not only tightly woven but tightly stretched on a wooden frame and securely tacked in place.
I believe it comes from Africa.
An upright piano.
CANVAS
A graffiti canvas.
Artists
Artists.
Patrons
Hairdressers
The best artists
Artists