[benice (OP)]

The surface in above image is a portion of the graph of
some mathematical equation.

Let's do some brainstorming:
Can you guess what's inside the surface?































Answers:

A funny 3D image:


A funny curve:


The above graphics were created completely using math formulas and math softwares.

[benice (OP)]

Hint:
Consider the intersection of a horizontal plane with the surface.

The intersection consists of a family of funny curves.
(An example curve is shown below. It has nothing to do with the answer.)

Cut off the upper surface above the horizontal plane to get a funny 3D image.


(This curve is obtained from another surface.)

[JP]

Is the answer a can of spam?

[Geezer]

LOL!

[AliKhalid]

Dame i cant understand what is it? i don't like math..update the answer

[yor_on]

Look like those baking plates you make Christmas cookies from, doesn't it? Pepparkakor (pepper-cokies we call them:)

I'm sure it is, or spam-cookies?