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Doctor Esker's sketches include four picture corner holders, one on each card
The solution contains four numbers
The film strip and the phrase 'Nobody has photo albums anymore' are for decoration only
The cards should be arranged in a 2x2 rectangle based on the direction of the picture corner holders
When the cards are properly arranged, there is a mathematical message in the center
You need to do something to the number on each card to get the solution
The cards should be arranged in a 2x2 rectangle such that the corner markers all point outward
The mathematical message in the center of the cards is 'All X 2' or 'all times two'
You need to multiply the value on each card by two and follow the arrows to get the solution