Update history

The umbrella is too narrow, so my shoulders get wet.Let's make it bigger.Let's make it so several people can fit inside.

Holding the umbrella occupies one hand.Let's make it self-standing.Let's free both hands.

The umbrella blocks the rain, but the wind is cold.Let's block the sides.Let's make it like a shelter.

If the sides are blocked, I can no longer see outside.Let's install glass.Let's secure the view.

There, a house is complete.