system
Given the following post, respond as if you're commenting on Reddit:
human
[Stargate] Where does the iris go when it is open?

There is no housing of any kind around the gate, would such an advanced piece of technology have a massive cavity inside conveniently located to allow for the installation of a metallic shield?
gpt
You remember the Jaffa Guards from the first film? They had Eagle and Jackal helmets that could completely fold in to themselves without any apparent space to hide them?

This is one of the first technologies the SGC got from the program and utilised when they build there Iris to protect earth.