This exercise is kind of fun. So what you do is you create a 90 degree angle or at least close to one. It doesn't matter and this is going to be a fanning exercise. So you begin from the corner and you just start to fan out. This is going to help you with a lot of stuff and everything from box drawing to linear perspective. And then you want to be sure to go the other direction and just fan out. You can fill in in between whatever you need to do. You also want to be able to go at any angle that you need. So practice all four directions. Again always just going from the center. And you try to keep the fans even as best you can. If you need to turn the paper, turn the paper. Now one of the trickier fans and you can do interesting things with that, I call it the progressive fan. So to do as you start out with your 90 degree angle and then you start narrow and you get larger as you come down. Narrow, narrow, larger, larger, larger, and so on. So you narrow it out. That wasn't a great one. Let me try again. Try this direction. Go go. Narrow, larger, larger, larger, larger, larger. So you get kind of this feel that the fan is progressing as it comes down. This exercise is a dual fanning exercise. What you're going to do is create a long bar with two 90 degree angles. And then you're going to fan all the way up relatively evenly. And then you're going to do that in both directions. And this is kind of a linear perspective exercise is if this is the horizon line and you're drawing a grid on the ceiling or something like that. Another one that you can do. And this one getting to be a little bit more hand-eye coordination oriented draw line and you make a couple of tick marks. And what you're going to do is you're going to draw right triangles. So you have to envision and imagine this right angle at each one of these points. Another fun one is a little variation on the dual fan. So what you do is you first do your 90 degree angle exercise. Right, make sure that's 90 degrees. And then you can do your dual fanning from there. There's a reason for that which I'll go into in linear perspective.