How to build a hidden door

Required items:
Any type of block
bearing
controller
switch

Firstly make a 16 block long pole with a bearing on the side of the top block.

Then place a 9 block pole to the right and a controller and a switch (place the last two where you want them) also connect the controller to the bearing.

Next make a 8 block long pole attached with a bearing. DO NOT connect this bearing to the controller.

Attach a bearing to the end of the 8 block pole. to the bearing make a upside down T which is 3 down and 3 across. to the bottom of the T ( because its upside down its the side closet to the ground) attach a line of blocks which go down to the platform the door is being created on.

On the bottom of the sides of the T place bearings. Attach a rectangle to that which goes back from where you enter the door from. the best is 4 wide and down to the ground.

Next create a box above the door so that when it is raised the door will still be able to go back down into the frame.

Next attach the door bearings to the controller. You should only have 3 bearings attached so if you have more or less you did something wrong. (unless you are attaching other things intentionally)

This is how it will be setup when you DO NOT right click on the bearings to change their direction.

This is the default position.

This is the pressed position.