Question

How does an octopus make a screen

Answer 1

An octopus sprays some of its ink to create a screen. The screen is black (because of the ink), so it makes it hard for predators to see and eat the octopus.

Answer 2

Well, the octopus makes a screen so it can distract its enimies...
~You know how in real life, how a screen-door can keep out the bugs, per-say? Well, an octopus's screen, can keep out the enimies from seeing it. Leaving it able to get away.
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Hope this helped! :)