I am doing advanced calculus at university - prob why.
Anyway I can explain it in 3d. I took a cube and the side is a square right.
So a square on one side is a line on the top, if you take another side and its line the intersect will give you a point on the top.
In my dream this was how i was equating who my target customers were. They were the points. They fell into two overlapping datasets which were the squares.
Except it was in 4d and the squares were cubes.
Now during the dream this was eureka material man. I had found the golden challice.
Really its datamining to find customers matching a criteria. But I will look into this now beacause I am intrigued.