Last night whilst I was watching TV (and practicing various sleights) I found myself staring at the three of hearts and I realised that two of the hearts faced one way whilst the third was upside down. I went through the rest of the pack and found there were quite a few that were designed in this way (for example the six of clubs has four clubs facing one way and two facing the other way). I'd never really paid the spots that much attention before.

I must add that I'm using 'bikes' but I assume other pack of cards are the same.
I quicky gathered these cards together and put them so that the larger number of spots were at the front of the pack and got my wife to select a card and look at it. Whilst she was looking at it I turned the small pack around and then handed it to her and asked her to put the card back into the pack somewhere. She then shuffled them. She was amazed after I had thumbed through the cards and was able to announce which one she had chosen.
I'm sure many of you must have discovered this yourselves but I thought I'd share it with those of you who haven't. I'm damn pleased with myself for spotting it and realising the potential use.

Another thing I noticed whilst I was staring at the three of hearts was that the hearts themselves aren't symetrical. The left side is slightly convex and the right side slightly concave. Doesn't have any bearing on anything....just something else I noticed
