Welcome to the EMO Community Forums, @alexander1 . . . I have moved your post to this thread as it pertains to dark tables and edge detection.
It actually does matter on the color the table. If EMO steps over the edge, he will sense darkness. The black borders generally work in the same way him stepping off of the edge but not always.
Changing the borders to white would actually make the problem worse since he would not recognize an “edge” even though it is just a solid color flat edge.
We advise all EMO owners to make a safe play space for him on your table around the home station mat. There are some suggestions here:
Also note that when EMO is dancing or doing activities such as playing games or other things where he needs to move around, his edge sensors are turned off, so best to keep him in a safe enclosed space.