How do you hang pictures and wall clock on wall without nails?

I have some pictures and a clock, I want to hang on the wall, but i don't want use hammering any nail on the wall. Are there's anything I can do to hang those except nails.How do you hang pictures and wall clock on wall without nails?
Use good brand double face tape if the surface of the wall is smooth or glue hangers.How do you hang pictures and wall clock on wall without nails?
I use thumbtacks, line up a few (more depending on the weight) in a straight line and the top of the picture frame will catch on them and stay up.





Clocks are a bit more difficult, depending on what kind you have and how heavy it is.





Thumbtack holes are also less noticeable and easier to cover up if need be.
Wall Mart carries those hooks advertised on TV that go through the wall with a very small hole but will hold up to 75 pounds. The cost about $4.00





Thumb tacks? LMAO
You must penetrate the wall, one way or another as I wouldn't trust adhesives. Otherwise, put them on a rack.