One of my students has a lot of trouble with 1:1 correspondence, and I noticed today that she seemed to count better on the board with the items directly in front of her than when she's counting manipulatives at her desk (when she has to look down). This doesn't "fix" all the problems, but she seemed to count better with the work in front of her. I'm trying to decide whether to glue in the felt or not. I like the idea of being able to change out the felt "boards". I'm going to make one that is 1/2 and 1/2 for vertical addition.