It is a small cube in a room or a large cube that lacks one corner?
This cube is easier to draw than to describe in words how to draw! We used a squared paper to draw (freehand!) the lines that create the cube, counting six segments to the outer cube and three for the inner cube. While drawing you have to follow the instructions carefully, only under this condition will be possible for everyone to realize this plan!
When we finished the pencil drawing each student chose two colours in three different shades: dark-medium-light (eg: 3 felt tip pens green dark-medium-light and 3 felt tip pens red dark-medium-light).
Following the three directions of space we colored the chessboards with the colours chosen (the two dark colours for the first side, the two medium colours for the second side and the two light colours for the third side).
I’m an Italian art teacher and I'm glad to teach now in a Middle School of North Italy. This blog is a place to share, swap, and explore lessons, educational systems, techniques and creations in other art classrooms around the world.
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Hi,Great blocks! I love your blog and your nice ideas
Have you ever tried to use isometric paper to the project? I used that with my 4th graders – if you want to see, please go to: http://www.frubilledkunst.dk/op-art-del-6-terninger(It's in Danish, but there is a translator and lots of pictures 
Tina
Hi Tina! Thank you! I had a look at your blog and is very useful!!!Many thanks for your suggestion!