I guess, one of the reasons why I’ve been fond of the glass painting was the door.
A room door + shortages during the soviet time + (the most important) my father who was an artist and painted flowers on our doors + tedium, no Internet, a lot of free time, so I could spend almost endless time glazing at those flowers in my childhood:
How they were changing the colors when the light was different or when the door was shifted, and the cupboard, wall, sofa, or windows became a background.