How Can My Parrot See Me Through Tinted Glass?

Our back door has tinted glass, so no one outside can see in.

When I stand at a certain distance away from the door (when I am inside), no human can see me and it’s obvious the dogs can’t see me (if they hear me they look past me in the wrong direction).

However, when my rainbow lorikeet’s cage is outside to get some sun, he can see me immediately. Every single time. And it’s really obvious that he can see me. How is that possible?