Items you will need:
Glass
Any block
Sticky pistons
Redstone
Lever1: Dig a row beneath the length of the window.
2: Fill it in with upward facing sticky pistons.
3: Put glass on top of the sticky pistons.
4: Don't forget to leave a space between the bottom row of glass and the rest of the rows of glass.
5: I like to build the floor up a block to cover the pistons. (This room therefore has a raised dais of sorts and it looks cool.)
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Minecraft Furniture Ideas
De TodoNobody else seems to have written a handbook on here, about building different types of furniture in MCPE. I hope this helps some other minecrafters! (Pictures are included) Don't forget to leave a like!!!