Clip comparison

You will see pairs of short clips (30 seconds each, no sound). Both show building work in a house. For each pair there is one question. Watch both clips to the end, then tap or click the clip you prefer, or press "No preference". You can play a pair again as often as you like. There is no right answer; answer by what you see.

Each answer is saved as you give it. You can stop at any time and come back later with the same code.

Thank you.

Your answers are saved. If more pairs are added later, you can come back with the same code and go on.