The Tripwirehook will open a Trapdoor behind the Block withot activate the Tripwire after a randomtime automaticly.

1. Place a Block (Stone, Woodlog or else)
2. Place a Tripwirehook on on Side
3. Place a Trapdoor on the otherside
4. Watch and Wait

The Trapdoor will open after a randomtime.

P.S.
Crafting Slaps and Stairs from the new coming Stoneblocks (Granite ect.) will be a very nice Idea
Also to place Slaps verticaly on Blocks will be make some more nice buildings.