Alice from the Royal School did a sketch of the images she'd pictured in her head. Here are the two she sent us:

Well done, Alice. I wonder if you can say which colour cube is hidden in each case?

A group of pupils from Lillington Primary School also sent us images of what they imagined the first building to look like:

This is from Abbie:

This is from Chelsea:

Here is Kyle's picture:

And finally, from someone else, who's name I couldn't make out, unfortunately: