The sponge is chameleon skin, it is heat effective, so it changes colour when heat is applied with the hands. Meaning the pattern on the outside of the portable computer is never the same, and decided on by the user. The colour change only last for so long, so by the pattern created isn't perminant and can be constantly changed.
The sponge layer also provides protection for the portable computer if it is dropped or knocked by something. Also as the portable computer is already a bag itself, it does not need to put into a bag to be carried around.
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