Selector: Block Presence

Selector: Block Presence is a Number Spell Piece added by Psi. It will analyze the composition of a block at a given position. The possible values it can return are:
 * 0: No block or a replaceable block exists at that position.
 * 1: A non-solid block exists at that position.
 * 2: A solid block exists at that position.

It is unlocked in the lesson "Detection & Focus."

Parameters

 * Position: Requires a vector.