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The book is not worth it in any way whatsoever. Just make a point to tell your brain to fuck off when you look at objects artistically, look through how you think thinks appear and see the real shapes. Close one eye, make a box with your fingers if you have to, try to see it in 2D.
Print out some coloring book pages, turn them upside down, force yourself to forget what they are, and try to copy them by looking at lines and shapes.
The book is 95% bullshit, the exercises are readily available elsewhere for free (in this very thread), just skip it and get dodson or something that isn't woo.