# Explain this optical illusion **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [June 21, 2018, 3:53am UTC](https://community.cartalk.com/t/explain-this-optical-illusion/119561 "2018-06-21T03:53:09Z")\ **Posts on this page:** 8\ **Page:** 2
**Author:** ![B.L.E](https://avatars.discourse-cdn.com/v4/letter/b/848f3c/32.png) [@B.L.E](https://community.cartalk.com/u/B.L.E)\ **Post date:** [June 22, 2018, 10:01am UTC](https://community.cartalk.com/t/explain-this-optical-illusion/119561/21 "2018-06-22T10:01:28Z")
Modern HDTV doesn’t really strobe like the old CRT TVs did. They don’t have a frame rate, they have a refresh rate, and only the pixels that have a different brightness value change. This allows high definition without having a ridiculously huge bandwidth. ---
**Author:** ![keith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/keith/32/5518_2.png) [@keith](https://community.cartalk.com/u/keith)\ **Post date:** [June 22, 2018, 8:51pm UTC](https://community.cartalk.com/t/explain-this-optical-illusion/119561/22 "2018-06-22T20:51:57Z")
> [@B.L.E](#): > > Modern HDTV doesn’t really strobe like the old CRT TVs did. They don’t have a frame rate, they have a refresh rate, and only the pixels that have a different brightness value change. This allows high definition without having a ridiculously huge bandwidth. This is very true, and from what I know, they don’t go black (or gray) between changes like a CRT does, so they don’t flicker at all. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [June 22, 2018, 9:14pm UTC](https://community.cartalk.com/t/explain-this-optical-illusion/119561/23 "2018-06-22T21:14:55Z")
Explain this optical illusion! At least it has something to do with cars. Tester ---
**Author:** ![Yosemite](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/yosemite/32/643_2.png) [@Yosemite](https://community.cartalk.com/u/Yosemite)\ **Post date:** [June 23, 2018, 3:40pm UTC](https://community.cartalk.com/t/explain-this-optical-illusion/119561/24 "2018-06-23T15:40:11Z")
@Tester . I watched that show when they did that one. Amazing what he can do. Yosemite ---
**Author:** ![Marnet](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/marnet/32/41_2.png) [@Marnet](https://community.cartalk.com/u/Marnet)\ **Post date:** [June 23, 2018, 5:16pm UTC](https://community.cartalk.com/t/explain-this-optical-illusion/119561/25 "2018-06-23T17:16:39Z")
This discussion is a prime example of why I enjoy reading on this forum. In addition to learning how better to maintain my car, I learn an abundance of interesting things about an extensive array of other related topics. Thank you, as always, to those who share your varied knowledge. 😁 … Still reading, still learning! … ---
**Author:** ![keith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/keith/32/5518_2.png) [@keith](https://community.cartalk.com/u/keith)\ **Post date:** [June 23, 2018, 6:24pm UTC](https://community.cartalk.com/t/explain-this-optical-illusion/119561/26 "2018-06-23T18:24:44Z")
It’s the “Cattle Car Syndrome”. ---
**Author:** ![jtsanders](https://avatars.discourse-cdn.com/v4/letter/j/c2a13f/32.png) [@jtsanders](https://community.cartalk.com/u/jtsanders)\ **Post date:** [June 23, 2018, 8:06pm UTC](https://community.cartalk.com/t/explain-this-optical-illusion/119561/27 "2018-06-23T20:06:30Z")
There are two cars, one with the moonroof and one without. The driver is in on the illusion. Pull the one with the moonroof in, test it, then cut the scene and replace it with the car without the moonroof that has the magnetic appliqué. Remember, this isn’t live, it is filmed. Still, a neat trick to arrange everything so that it appears there is only one car. ---
**Author:** ![Yosemite](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/yosemite/32/643_2.png) [@Yosemite](https://community.cartalk.com/u/Yosemite)\ **Post date:** [June 24, 2018, 2:52am UTC](https://community.cartalk.com/t/explain-this-optical-illusion/119561/28 "2018-06-24T02:52:06Z")
And I thought if was done with “Smoke and mirrors”. Yosemite [Previous page](https://community.cartalk.com/t/explain-this-optical-illusion/119561.md?page=1)