I disagree – and it took me a long time to accept this. Objects are real; they are emergent properties of a system.
Chain mail. Ever make chain mail? Take wire. Make rings. Hook rings together into a sheet. This sheet can repel arrows up to a certain … point as it were.
Were you protected from the arrow by the sheet of chain mail? Yes.
The protection was not an illusion.
I believe your engagement is limited to viewing.