It sounds like that part of you that changed the room around has somehow gained the courage and the confidence to show itself. The room change is it’s way of making itself known. It probably took this part a long time to find the courage to do that. I see it as a positive thing - a healing thing. This part of you feels safe now and is able to express itself in this beautiful way.

If other parts of you are not happy or comfortable with the room changes, perhaps some negotiation can help. Maybe allowing the other parts to add something to the room that represents them would help.

If the room changes again, don’t fret. That part has had their say and is happy to allow other parts to do the same. Other parts may have helped the part who changed the room in the first place. Sounds like some parts are definitely working together - this is always a good thing.

Try to simply go with the flow. I found meditation helpful. It helped me to be more calm and flow with the events allowing parts to take turn in expressing themselves.

The scariest thing about all this is the not knowing. Not knowing why things happen or change is scary. Being prepared to go with the flow allows them all to express themselves and it makes life easier.