Alice growing effect in 1972 "Alice's Adventures in Wonderland" - how was it done? It's not green screen
How was this scaling effect done?
My first assumption would have been green screen, but it's clearly not - she's taking on all the light and shadow from the scene around her. Even modern green screen probably doesn't look that good. Well maybe only nowadays, but certainly not back in 1972 or even 10 years ago.
She scales up perfectly, and then at the end, falls against the wall, interacting with the scenery.
You can even see her shadow interacting with the back wall on the left during the first half of the growing, and then in the latter half, her shadow is interacting with the fireplace on the left as well.
As far as I can tell, it looks perfectly real... and from a movie made in 1972.
I've tried to wrap my head around how they could have done it with forced perspective somehow, while moving her and the background towards/away from the camera, together or separately, but that just doesn't work...
Best Answer
The Ames Room, forced perspective, and moving towards the camera.
The left side of the room is much larger and farther away than the right side of the room. Take a look at the same illusion here:
She is pulled towards the camera in the beginning, and then moves to the right area, which is much smaller than the left area. After the camera cuts, it's just a tiny room with miniature everything and Alice in it.
Pictures about "Alice growing effect in 1972 "Alice's Adventures in Wonderland" - how was it done? It's not green screen"
Why does Alice change size in Alice in Wonderland?
The key, once again, is adaptability. Alice's size changes also bring about a change in perspective, and she sees the world from a very different view. In the last trial scene, her growth into a giant reflects her interior growth.Why does Alice grow and shrink?
She finds a bottle marked \u201cDRINK ME\u201d and downs the contents. She shrinks down to the right size to enter the door but cannot enter since she has left the key on the tabletop above her head. Alice discovers a cake marked \u201cEAT ME\u201d which causes her to grow to an inordinately large height.Does Alice in Wonderland use CGI?
Alice in Wonderland\uff082010\uff09is an American computer-animated film directed by Tim Burton, released by Walt Disney Pictures and adapted by a Lewis Carroll's classic fantasy adventure novel of the same name. The film praises for wonderful visual experience and special effects, the beautiful 3D detail designed in each scene.How did they film Alice in Wonderland?
Alice in Wonderland2010Alice Through the Looking Glass2016Alice's Adventures in Wonderland Peter Sellers 1972
More answers regarding alice growing effect in 1972 "Alice's Adventures in Wonderland" - how was it done? It's not green screen
Answer 2
I agree with BlueMoon93 that the illusion of growth is obtained simply by dragging Alice towards the camera (note that her legs and the floor are not visible).
However, I think that Ames room was not used. The room could have been perfectly ordinary. Meanwhile, the wall to the right, which Alice got thrown against, did not actually join the ceiling: if you take a close look at a still frame, you'll notice that there is no white border between it and the ceiling, like the other walls have, and the left side, where it seems to join the far wall, even is curved, probably to accommodate the pictures. And I didn't see any moment when Alice's shadow passed from this wall to the ceiling.
To sum up: Alice is dragged towards the camera, probably on a cart, and ends up next to a small, say half a metre high, fake wall. Clever lighting masks the gaps.
UPD: I went back a little and noticed that the original wall was also sloped, so this is not an argument in favour of a separate wall per se. Nevertheless, while I don't have definite proof, such approach would definitely be much cheaper than building a full Ames room for a few seconds of screen time. 
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Anete Lusina, Anete Lusina, Kelly L, Kelly L