What is the fastest way to view images from the terminal?

I have created a tool that uses various unicode block graphics characters to improve the resolution (compared to the canonical 2 pixel per characterapproach taken by other solutions posted here). It also automatically displays images in a thumbnail mode if multiple images are provided as input.

Installation:

git clone https://github.com/stefanhaustein/TerminalImageViewer.git
cd TerminalImageViewer/src/main/cpp
make
sudo make install

Usage:

tiv <image(s)>
More details at the github project: https://github.com/stefanhaustein/TerminalImageViewer

Example screenshot:

Picture, Raspberry Pi