332 Shading the cubes in your Penrose triangle

…In this movie, I'll show you how to take that…impossible pen rose triangle of cubes that we created in the…previous movie, and we'll shade the cubes using a few…gradients in order to create this tricked out classic effect here.…So, I'm going to start things off by pressing Ctrl+-,…or Cmd+-,…on the Mac to zoom out slightly.…Go up to the View menu and make sure your Smart Guides are turned on.…If not, go ahead and choose the command…and then, switch to the Rectangle tool, which you…can get by pressing the M key and click in the top right corner of the artboard.…

You should see the word Intersect.…Clicking with the tool brings up the rectangle dialog box and I want you to…enter the size of the artboard, which is 720 points wide by 500 points tall.…And then, click OK in order to create this big, white rectangle.…Now, I'm going to set its stroke to None, up here in the Control Panel.…I'm also going to set the fill to black.…Now, obviously I don't want this rectangle to be in front of everything else, so I'm…going to add a new layer behind the active one by pressing Ctrl+Alt+L or Cmd+Option+L…