This is the stump of a ‘Bloodgood’ Maple that was cut down several years ago (2009, if I recall). Now a large mushroom has formed to “digest” the remains.
Here’s the stump–or what’s left of it–from another angle. If anyone doubts that “shelf” mushrooms are bad news for trees, check out the shelf mushrooms on this stump! They are clearly a sign of the decay process at work!