Press Space to change the cursor's size, probably to prove that it's an SVG. These are SVGs that have blur filters in them, something you should not be able to do in the Scratch image editor. If you try to make one change in the editor, the SVG snaps back to a version without the drop shadow. Unfortunately, the blur square that's on top of the yellow and red squares does not blur other sprites. Also click on the "cursor" to see the macOS loading cursor.
