TITLE: What type of surface is it?
QUESTION [6 upvotes]: The picture shows Sphere, Torus, Klein Bottle and Projective Plane, respectively: 

What about the following one? Is it also Projective Plane? :
 
PS inside triangles and color in shapes are irrelevant.

REPLY [7 votes]: Yes, it too is a projective plane, as you surmised. Just combine the left and bottom edges into one, and the right and top edges into one.