Levels 0 to 7 walkthrough solution video.
Tips and Tricks
By far the best tip is do not try to decipher the puzzle by looking at the object. Keep an eye on the shadow at all times.
Always check how 'hot' or 'cold' you are. The more lights that are illuminated, the closer the object is to being in the correct position.
Remember to rotate it, as well as spin it around. It's not always easy to spot the image in the shadow if it's upside down.