system
Given the following post, respond as if you're commenting on Reddit:
human
Why does your computer screen look 'liquidy' when you apply pressure to it (i.e. pressing your fingernail against your pc monitor)?

wow thanks for all the responses! very interesting comments and im never unimpressed by technology!
gpt
Because it *is* liquidy.  The screen uses something called a "liquid crystal", which is a layer of a special liquid sandwiched between two pieces of glass or plastic (or one piece of glass and one piece of plastic).  

This liquid is what forms the image, by changing how it interacts with polarized light depending on the electric field applied.