It's very easy to find the blind spot with the mouse cursor. Close one eye, and with the other look at the opposite side of the screen. Move the cursor around on the side corresponding to the open eye. You'll plainly see the cursor disappearing and reappearing—meanwhile, your brain pretends that it knows static content that's in the spot. Most probably, it will even interpolate movement for videos—as it wont to do.
if ur on a mac shake the cursor really fast and the arrow grows massive. never noticed that before. I was using my curosor to check the blindspot on my eye and was wiggling it in and out at the edge and it freaked me right out. it went in small, disappeared and came out 20x larger. I was like fuck me these eye tricks are mental.