The very first modeling work is now complete.
However, when I run the physics operation, only the initial movement goes wild.
I also checked the collision, but there is no particular contact.
I'm not sure what the cause is, but I think I'll call it done for now.
Before I move on to the next modeling work, I'm going to make one illustration work.
P.S. If there are any knowledgeable people out there, I'd be happy to get some tips!