This site has a 3d grid looking like a sombrero as a logo. Does it represent some specific physical phenomenon or is it just art?
It could very well be the diagram that is always drawn for spontaneous symmetry breaking (SSB)! SSB is quite an important phenomenon, and its sort of the foundation for the Higgs mechanism that got a Nobel prize this past October.
Whilst I can almost guarantee the author of the logo did not have this in mind when creating it; a physical phenomenon that may be described via such a potential is the Two-Level-System (TLS) defects we see in superconducting circuitry that involve Josephson junctions. In a recent paper we describe what occurs when an oxygen atom delocalises around an Al-Al bond axis. The potential of the rotationally symmetric case is a "mexican hat" - exactly like the logo.
I don't know the original motivation of the author, but I reckon it could represent a wave on a membrane or the wave function of a particle for a symmetrical condition.