How do you regenerate a block?

I made a script so that a block gets unanchored after you touch it, so it falls down from a tall height, now how do I make it so that it comes back as it is in the same position?

Clone it before it's properties are changed then clone the clone into Workspace.

I'm going to use example variables since I don't what the variables of your brick are.

local Position = Origin.Position
Origin = script.Parent
local Lighting = game.GetService('Lighting')

new=Origin:clone
new.Parent = Lighting
local debounce = false

function anchor(v)
         if Origin.Anchored = true then
        Origin.Anchored = false
end

function onTouched(hit)
	local humanoid = hit.Parent:findFirstChild("Humanoid")
	if humanoid~=nil and debounce == false then
		debounce = true

		debounce = false
	end
end

wait(24)

new.Parent = Workspace
new.Position = Position
 
return
script.Parent.Touched:connect(onTouched)

That should work, but message me if it doesn't.

This might help. http://wiki.roblox.com/index.php?title=Instantiation_of_a_part