You know you've probably lived too long when Spiral Jetty turns up on Antiques Roadshow.
A true antique (Latin: antiquus; 'old', 'ancient') is an item perceived as having value because of its aesthetic or historical significance, and often defined as at least 100 years old (or some other limit), although the term is often used loosely to describe any object that is old. An antique is usually an item that is collected or desirable because of its age, beauty, rarity, condition, utility, personal emotional connection, and/or other unique features. It is an object that represents a previous era or time period in human history. Vintage and collectible are used to describe items that are old, but do not meet the 100-year criteria.
Guess I should get my photos of Vito Acconci jerking off under a ramp on there.....