INTRODUCTION TO EDUCATIONAL ADVERTISING, OR LOGO-PUZZLES

Click at different places on the screen.

This is my Logo. It's a rectangle cut diagonally, and a quarter of ellipse. (Ellips is a shadow of a circle, projection)

WHICH AREA IS BIGGER, COLORED OR WHITE ?

Hint: Start with a square, then use the above definition of ellipse.

Answer: Same! Moreover, there are two pairs of equal areas (which ones?)