Here is my sketch:
I must say I was surprised to find a crack in the floor at this early stage!
I then gave up on the Len Lye Centre and went to their cafe "Monica's Eatery." I found much more to sketch in here. I decided to get out my pen and coloured pencils. This is the first pen sketch I've done since July 2014. Goodness! I think I need to do a few more. I sketched very quickly as I was concerned the two people would leave any minute. They had that look about them.
Here is my sketch: