I have no idea what 4 ounces of fur looks like, though I suspect it's a pile that's larger than most cats.
I can show you what it looks like on my cat though. I took Thufir in to get his Summer do (a buzz cut from the base of his neck to the base of his tail) this morning and I was curious how much all of that fur actually weighed. He weighed 17 lbs. 4 oz. before I took him to the groomers and 17 lbs. 0 oz. afterwards.
Here's the before pic of him being weighed in:
And another before pic of him eyeballing my shrimp.
And here he is after the grooming:
Here's the before pic of him being weighed in:
And another before pic of him eyeballing my shrimp.
And here he is after the grooming: