Kamikaze Hummingbirds - Mystery Solved

Today 3 more humingbirds crashed into the picture window. Luckily, they all survived.

However, that got me thinking...
So, I went outside to see why they (and the occasional dove) insist on flying into the window.

Here is why...
(pictures of the window, taken from the garden)

If you don't study it too closely (think like a bird), it looks like another whole area of the garden to be explored.

Now I got to find some way to prevent any further suicides!