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16 pixels by 16 pixels is a common resolution for assets matching a low-res pixel art aesthetic. Although the assets may not be specifically 16x16, they are designed to work in a graphical setting where objects are around that size.

Things you press

Resources relating to or for building Graphical User Interfaces (Commonly called GUIs)

Pixel Art refers to the charming, simplistic, retro/renaissance style of very-low-resolution graphics, such as from the 1977-1995 Atari, GameBoy, & Super Nintendo (SNES) eras.

The graphics that make up a tile map

Resources for building and relating to User Interfaces, how the user interacts with your program