Oh no! I was trying to figure out if this was artwork, some kind of plant life or… A broken window! I’m so sorry it was the window, but it is a beautiful photo.
I have heard of this happening before and can’t remember what I heard causes it. I was sitting by my mother’s patio door once when it happened. Fortunately the glass did not explode all over the place, which looks like what happened here as well.
@grammyn thank you for sharing that this happened to you too - I've never come across it before! Luckily our glass didn't explode out either; it's safety glass and seems to be holding. We did drag a big tarp underneath it though just in case! Waiting for new glass to be cut now ... (It's a big custom-made feature window so no quick fix)
I have heard of this happening before and can’t remember what I heard causes it. I was sitting by my mother’s patio door once when it happened. Fortunately the glass did not explode all over the place, which looks like what happened here as well.