The font-size of the div containing each image was causing the images to start shifting
downward when their height dropped below the font-size.

They'll always be 3/10ths as tall as the world is.

This also gets rid of the groups, which were messing up the layout.

All of the entities are rendered to the canvas. It only renders images, so there are no
names, height bars, etc.

You can paste an image into the window to get a temporary entity.