Happy Days Toilet Roll

One the most enduring dilemmas of the modern age concerns itself with which is the correct way to hang up a toilet roll? i.e. Should the paper feed off from the front, or from the back of the roll?

Various arguments are made for each of these positions, but now the matter has been fully resolved with the introduction of The Happy Days Toilet Roll. This is because both states are equally provided for in equal measure, and everyone's happy with their toilet roll. (very important)

Here’s how it works:
When the toilet roll is installed, the paper feeds off from either the front or the back, but when it’s half used up, the direction of how paper has been rolled, doubles back on itself and is therefore rolled on in reverse. This means that no matter whether the roll starts off with the paper feeding from the front or back, this will be automatically reversed half way through.

If you want to understand the idea better, take a long strip of paper and begin rolling it unto a pencil. When you get half way along, fold the strip over, and continue rolling up the remaining length. Now when you start pulling it off, it will reverse direction at the half way fold over point.
Voila! Age old dilemma solved :-) Happy days.

Inevitable deluxe variation features dual colour paper, with the second colour starting at the half way point.