A Constant Companion

The black blob that follows you around

He might be gone

Or in a Fawn

He might be hidden or gone 

He is your constant companion

And he never leaves your side 

He will not go down even if you take him to the ground 

He is made from light

And can only be killed 

By from which he was born

Light 

He makes you large and tall 

He makes you big and you seem to be tall 

He grows and grows until he is as big as a mall

Making you small

He only comes from certain things 

An opaque object from which he comes

They let no light 

And make bring him to life 

Transparent and Translucent 

Got nothing on Opaque 

They are puny in comparison 

And got nothing to make 

A shadow is so cool

And he is your constant companion 

Has nowhere to go 

Unless beating by light 

Only some can make him while others can't 

He is a constant companion 

But make sure he isn't under your mat!