In Portal game by publisher Valve there is a technology robot called Cores which is also referred to as spheres or personality cores.
What these robot cores do is it house advanced artificial intelligence, mostly unique for their ability to express emotions.
A Japanese papercraft designer nicknamed Mr.Cube has made a papercraft models based on these cores .
It requires only 1 sheet of paper and comes in 4 version which is wheatley, space sphere, adventure sphere and Fact sphere.
Wheatley is the final antagonist in single player game of Portal 2 while the other 3 cores are corrupted cores