To make the alien, give value a=3 and b=2 because a>b. Start off using the equation ((x^2)/(a^2))+((y^2)/(b^2))=1 to give out the eclipse of the outer eye. Now change the interval of b so it wont pass the range of [-2,2]. Give value e=3 and d=2 because e>d. Now create a second eclipse in the eclipse ((x^2)/(a^2))+((y^2)/(b^2))=1 with the y-intercepts at (0,2) and (0,-2). The second eclipse's equation is ((x^2)/(d^2))+((y^2)/(e^2))=1 to give the eclipse in the outer eye which would make the second eclipse the inner eye. Then type in Origin(0,0) to make the pupil of the one eye. This makes the whole one eye. Attach a slider b and e using the tool slider on the geogebra window to make both eclipse up and down like the motion of an eyeball.
