These little waxy play strings showed up in an Easter bag from Boo's grandma's. They are fantastic!!! Anything that helps her to notice small details and contours is good for her eyes. When we were in the desert (a camping we go) we noticed how diminished her vision is currently. She had a hard time identifying changes in terrain. She couldn't located large caves or rock formations, last year she would have seen them easily. We also had several 'missteps' on the rock face when she didn't see a depression or mistook a shadow for a rock.
Every time I look up Boo is back at it creating away.
Bust she is not the only one loving them Boo's dad seems rather fascinated by them too.