設問 1:
What was John Goffe Rand's most significant invention for artists?
設問 2:
In which year did Rand patent his famous collapsible paint tube?
設問 3:
Besides being a portrait painter, what other profession was Rand known for?
設問 4:
In which city did Rand live and work during his productive years in England?
設問 5:
Which famous art movement's portability was significantly aided by Rand's invention?