Lens Tilt Demonstration (bowl of smoked tofu appetizer at home)
These first two shots show how tilting the lens affects the narrow plane of focus. This first one is straight, the second is tilted in an attempt to get the front & rear of the rim equally in focus.
Hamano Sushi
Lensbabies, Lensbaby-1 used for all these shots, at f/2.8 ISO 1600