Somehow, neither a shower nor a shallow tub delivers the same relaxing soak that a hot bath provides. Think of the energy required to heat a whole bath of water, however. In these straitened times, when bond traders are down to their last billion, this might be considered an extravagance.
Today’s invention is therefore a bath which is in the shape of the bather (eureka!). Most people would fit into a pretty generic gingerbread-man-shaped one, although those with a more rotund figure might need to order a bigger than standard size (think more doughboy).
The person-shaped tub would require much less hot water to fill and thus help save what’s left of the planet. It might be harder to find the soap, though.