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This is an utility prop, you can use in many ways. You can perform good mental effects with this, using one, two or all three envelopes. You get three window envelopes. Windows are covered with transparent PVC sheet. On the back of these envelopes are printed spots of differant colors, - Red, Green and Yellow. Inside each envelope there is a partition which divides the envelope compartments. Inside the two compartments you will find two more envelopes identical in size and shape. On the back of these two envelopes are printed colored spots matching the window envelopes.
On the front of the partition are matching colored stripes, which are visible through the window when you remove the envelope in the front compartment. The envelope in the rear compartment is not visible and the striped part of the partition looks like the back of the original window envelope, which now appears empty.