2 striped concentric circles which appear, because of an optical illusion, to be the portal to a 39 dimensional universe of cursed tesseracts and at least 3 different temporal dimensions. And the malevolent god of that universe is pointing a strobe light at you and forcing you to drink tequila. So a bit like most Birmingham nightclubs.
https://social-cdn.vivaldi.net/system/media_attachments/files/112/257/544/682/452/101/original/4d62aac915bd88c5.png