Dolphin or Car Illusion - Hybrid Illusion

Right now you probably see a happy little dolphin splashing in some waves. Cleverly disguised within the low spatial frequency of this hybrid is nothing other than a car, which you will see once you step back a few meters.

You are Close or Far Away Illusion - Hybrid Optical Illusion

Can you read what the poster below says? Now try and move further away from your monitor. Read it again, what does it say now?
Anyone has a clue how these hybrid optical illusions work?