Is this an optical illusion or something like relativity at work?

[Gingerbread Demon]

We live near an airport and planes fly over almost all day. There's a lot of training flights and student pilots learning to fly from our little airport. Anyway plane just flew over our house and the shadow of the plane moved really fast across the roof, yet when you looked at the actual plane it didn't look like it was moving that fast compared to how the cast shadow moved. Is the difference an optical illusion and the slow moving plane relativity at work?

I mean I know the plane is actually moving fast but that's not how it appears on the ground looking up.

 

[fireproof78]

Isn't that the parallax effect?

 

[Gingerbread Demon]

Isn't that the parallax effect?

I was thinking that too but wasn't sure

 

[Asbo Zaprudder]

It's parallax - the effective background of the plane is a lot farther from the plane than the plane is from the ground. Relativistic effects on moving objects aren't that noticeable until their velocity is about 30% of the speed of light. Where one does experience relativistic effects in everyday life includes the magnetic field around a wire carrying electric current and the colour of metals such as copper and gold.

E&M and Relativity

Relativity in Chemistry

More examples here:

10 Ways You See Einstein’s Theory of Relativity in Real Life

In 1905, Albert Einstein, developed his Theory of Relativity. This groundbreaking piece of work changed how we think and perceive the world around us,

interestingengineering.com