We have birdhouses on the terrace and therefore there are many birds in the garden. At least one collided with a sliding door every day. I've tried everything on the internet (drawing a grid with yellow markers, etc.). When one died after being banged on the door, this is what I found. I didn't want to block the view with bright opaque stickers and they don't block what you see. Since installation, not a single bird has entered the door.
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