If you have half an hour, then I recommend the above video lecture – because it will open your eyes to some of the trickery and shenanigans of retail architecture.
No longer will you wonder why the mall is full of seven different clothing outlets, all mostly the same. You will forget those feelings of confused bafflement at why THIS street is a shopper magnet, and THAT street serves only tumbleweed. But most importantly; Ikea, that mysterious beast of a furniture cathedral, will open her secrets to you, and the veil will fall from your eyes. You shall be its master, and the shortcuts will never hide from you again. All the meatballs you can buy.
Oh, and if like me, you’re at all interested in video game level design, then you’ll find some fantastically parallel knowledge of great use to multi-player flow and single-player attractors.