Is the 'impossible' room possible?

I'm playing through the Blocks That Matter demo and there's one bonus level called 'Impossible.' I have four blocks of sand I can arrange in a tetris shape and they're affected by gravity. I can jump 2.5 blocks' height and I need to reach a place that's high seven.

Is this level actually impossible?

Solution 1:

Obviously yes, Impossible is possible.

Unlike in Minecraft, sand takes a while before it actually falls down to gravity, so you can just build one tile higher and hurry before the entire contraption falls down.

Solution 2:

Here's an alternative solution, that uses the same basic idea:

Start by placing the blocks like this

As the blocks fall, jump out and back on top of where they're landing.

This method lets you get a little higher than if you were using the 4th block as a step.