I see the modes as shapes as well. Like you say, little boxes. I had a chart I made years ago with the modes, and their shapes as how they look on a bass fretboard. It's a really good visual tool that I wish I could post here. I'll look tonight, I thought I had a digital version at sometime. But that Sheehan video I posted, had some of those same shapes, (the boxes with tails)if you watch it again, pause the video when it's showing the shapes at the bottom of the screen. That will show you some scales to get you started.
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