Count Rectangles

A good puzzle that reminded me of a picture where you need to count the number of triangles:
At first it seemed very simple, but it turns out not. You need to count more diligently. I liked it, thanks

@EL797 Hi my friend! Although your text and its translation are clear, I don't know if I understood correctly which part of the construction I have to focus on to count the rectangles.

@EL797 Sorry my friend, this level is yet another testament to my ineptitude with math. Since I couldn't figure out how to count the rectangles despite your instructions, I gave up and watched your solution video. And the most disturbing thing is that I didn't understand anything; I don't know how to get to the intended solution. The coding and math challenges are definitely my weak point in Mekorama; I feel frustrated.

First, I thought: Count blocks! But that did not work. Then I read the title and noticed "rectangles" and that worked well. Made me remember those many "count the ..." puzzles, and I now see that @Denis Nazin has also added a picture of one above. @EL797 Thank you for the nice counting challenge, also the challenge operating those counting sliders!

@EL797 jajaja, you are right my friend, you found my Meko-weakness
By the way, I finally understood what had to be done. Imagine how lost I was when I was trying to solve it by counting rectangles on the building wall.