Still part of the studies I did last weekend. Was really productive those two days if I may say so myself This time mirroring rotated, tilted planes, which means every point of the rectangle is on a different plane in space ( so x, y and z are all different). Those are crazy, but really fun!
Also I do all exercises once with ruler and once without. That way I can see one time how it should look like and the second time exercise my free hand lines and learn to work more quickly
I am currently working on the tilted and rotated section here, the left side of your photo. I keep messing it up because I think I am setting it up wrong. I can do the tilted plane exercises with no trouble so I think the rotation is screwing me over. Any advise you can give? His new video talking about the rotation grid just confused me more.