How to divide a bed 13' x 10'?

Don't you start, Vinny
You have given me another idea though but I'm having difficulty sketching it on my envelope! If I can't draw it, I have little hope of planting it!!
I'll let you think about it instead.............its a rising sun with sun ray paths shining across the bed. The sun would rise as a semi-circle across one corner, probably the south west, as that is the first corner I'd come to from the house. The beds between the rays/paths would get wider as they reach the far sides, so they'd be like elongated triangles. the widest part of the bed at the edges could be tended from outside the bed.
I can see it in my mind with each "triangle" planted with a contrasting coloured leaf - like beetroot, planted next to carrots, next to yellow chard, next to red lettuce etc.

Of course, it would never work unless I could keep the chooks and dogs off it as they just trash everything!! No wonder I do a lot of random planting.

With a largish area like that it wouldn't require a massive effort to put a chicken mesh fence around it to keep dogs off. Doesn't need to be anything elaborate just a few canes threaded through the mesh and bunged into the soil.

Watch what you are doing with cardboard paths though as they can get quite slippy. Tread lightly and you should be OK though. I was going to mention a keyhole garden but think they are quite a bit of work to set up. A raised one would keep the mutts off!