The world on its axis, A picture unlevel, A dog that's confused, and an edge that is beveled. What do they have in common?

I have four corners, stay flat on your desk, hold words or drawings, but crumple with stress. What am I?

I’m tall when I’m young, and I’m short when I’m old.

I hold your papers or show a scene, one keeps things tight, one plays on screen.

I heal your stress and worry Moving blood within your body Unsavory reputation I do keep Although that's not really me The tool I use comes in handy To communicate with your anatomy