[Original writeup.](https://github.com/StroppaFR/CTF-Writeups/blob/master/2019/Evlz-CTF-2019/Dont-Blink.md)

The file is a GIF file. Each frame consists of a white screen with a seemingly random colored lines. The **persistence of vision** hint tells us to merge all frames of the GIF.

This makes the hand drawn flag appear.
> evlz{catch_me}ctf