I would bet that it started out as one of those little capsules that you put in water and they expand. They often have themes (dinosaurs, animals, vehicles) Those are that same kind of sponge texture.
Agreed. One of these: http://www.amazon.com/s/?ie=UTF8&keywords=sponge+capsules&tag=googhydr-20&index=aps&hvadid=30945581901&hvpos=1t1&hvexid=&hvnetw=g&hvrand=6482792433125253262&hvpone=&hvptwo=&hvqmt=e&hvdev=c&ref=pd_sl_e9nnshf5_e
Yep! I'm sure that we have some books downstairs in the kids' rooms with similar foam thingies!
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