Even though it's a "pushmobile" concept car (lacking motor, drivetrain, etc.), Lincoln's 1996 Sentinel is interesting. Unfortunately, when this post was drafted (early July 2017) there was little information about it on the Internet: examples are here and here.
Some observers regard the Sentinel as having Retro styling -- evoking the classic 1961 Continental. To a slight degree that is so. It also echoes a 1988 production model and explores a future grille theme.
Gallery
The 1996 Sentinel.
Here is a 2009 Lincoln MKS showing one of several variations of a circa-2010 Lincoln grille theme previewed on the Sentinel.
The Sentinel shown in the car dealership where it spent several years. It is painted a light gray, but the lighting gives it a warmer color.
The main similarity to the 1961 Continental is the sharp fender line.
Here is a '61 Continental for comparison.
Side view. As is often the case, concept cars are given wheels that are a little too large.
The Sentinel's passenger compartment greenhouse resembles that of the 1988 Lincoln Continental shown here, and not that of the 1961 Continental.
Side view of a 1961 Continental. Its main resemblance to the Sentinel from this angle is their simple, uncluttered sides.
High rear view of the Sentinel.
The 1961 Continental's rear design was not adapted for the Sentinel.
