Answer:
small land in water.
I have a little pool with two layers of wall around it. One white and soft and the other dark and hard. Amidst a light brown grassy lawn with an outline of a green grass.
I can be found in water but never wet
You heard me before and then again. Afterward I die until you call me again.
I always have to work with something in my eye.
I tell people to be careful when handling boxes.