The small exercise is to get a small experience in "spectral analysis".

Read the chapter, and your mission is to redo the result in Figure 7.

For that here are some input shapes

Bird, Kangaroo, Lion, Seahorse, and Unicorn,

And

Here is the matlab code that produced Figure 7.

1. Show more results with a larger variety of K's.

2. What K is enough to express well each shape?

3. What happens if we add the high frequencies of one to the low frequencies of the other?