Why I can't send escape sequences from keyboard, but can do it from another tty?

I am trying to understand how terminal works by doing different tricks, like writing from one tty to another, changing settings tty1 from tty2, etc. Also, I am trying to change a color by sending escape sequence from keyboard, directly. That is, not by echo -e '\e[0;31m' command, but by direct keyboard input. It doesn’t work. **I do this steps:** 1. Open tty1 and tty2 2. In the tty2 put bash into the sleep mode, by sleep 10m. Type word 'one'. 3. Go to tty1, do echo -n ^[[0;31m > /dev/tty2. The first character ^[ is typed by this way Ctrl + v Esc 4. Return to tty2, type word 'two'. Yes - the color has been changed to red by command from another tty. 5. Repeat steps 3,4, but with green color and word 'three' 6. And finally, I am trying to send the escape sequence not by another tty, but from keyboard directly - by typing ^[[0;37m in tty2. I do everything the same way - Esc (Ctrl + v doesn't needed, because readline is sleeping), then [0;37m, but get this: **Question:** Why does it work this way? All characters the same, terminal state the same, but in one case terminal get escape sequence, and in another case don't. ------------------------------------ **Edit** The question was answered here: [Echoed escape sequences doesn't interpreted in Linux tty](https://unix.stackexchange.com/q/518418/109397) .