# Negative dimentions? **URL:** \ **Category:** Factual Questions\ **Created:** [March 14, 2001, 7:16pm UTC](https://boards.straightdope.com/t/negative-dimentions/57990 "2001-03-14T19:16:11Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Enola\_Straight](https://avatars.discourse-cdn.com/v4/letter/e/dec6dc/32.png) [@Enola\_Straight](https://boards.straightdope.com/u/Enola_Straight)\ **Post date:** [March 14, 2001, 7:16pm UTC](https://boards.straightdope.com/t/negative-dimentions/57990/1 "2001-03-14T19:16:11Z")
Looking in Scientific American magazine, they announced the possibility of negative energy(ie antigravity) and thus exotic matter (with anti-mass…NOT antimatter). This got me thinking…If there is negative energy and negative matter…why not negative dimensions? if gravity=length_width_depth_time, does antigravity= -length_-width\*-length\*-time? ---
**Author:** ![Whack-a-Mole](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/whack-a-mole/32/141_2.png) [@Whack-a-Mole](https://boards.straightdope.com/u/Whack-a-Mole)\ **Post date:** [March 14, 2001, 8:17pm UTC](https://boards.straightdope.com/t/negative-dimentions/57990/2 "2001-03-14T20:17:04Z")
Negative matter isn’t too hard to visualize. Take a mirror image of matter (reverse its spin, give it energy that behaves in a opposite fashion from ‘normal’ matter and so on) and you should have it. Whether such a thing is physically possible is another thing entirely. However, I have a hard time visualizing negative dimensions at all. I mean, how can you have length in a negative fashion? A line may have a length ever decreasing towards zero length but once there how would it have less than zero length? About the only thing I can conceptualize as a negative dimension is one in which the arrow of time is reversed so fire unburns things, glasses unbreak and so on (this assumes time is the fourth dimension).