wondering...

...why is it that the logo on Spider-Man's back looks more like a tick than a spider? I mean, it has eight legs, but otherwise looks like a blob. The Watsonian explanation I can think of is that Peter's artistic and sewing capabilities for his homemade costume aren't that great, but the logo on the front is more delicate and is segmented, and looks much more like a spider. Maybe it's more simplified for distance visibility on the back?