Texture Aliasing

Screen pixels (bottom) match size of texels (top)
Minification: Squeezeing 12 texels into 11 pixels
Minification: Squeezeing 12 texels into 10 pixels
Minification: Squeezeing 12 texels into 8 pixels
Minification: Squeezeing 12 texels into 6 pixels
Moire patterns due to poor filtering