You can use cardboard, cut into strips about 10cm wide, and then stick them together with transparent tape to form a fence with a height of 10cm, and then put it on the sofa legs. ,

This can block the entry of small things, which is cheap and won't stain the sofa (if the children are older, just remove this), but it's not beautiful. . . . . Why don't you draw on it? ,,

In addition, if children throw it in on purpose, (I just had a child at home and saw this passage) is actually their curiosity about the disappearance and appearance of things, and they think it is fun to throw things suddenly.

For example, in front of children, we cover our faces with our hands and then take them away, which can make them laugh happily. In fact, they think our faces are constantly changing between disappearing and appearing, which is amazing.

If you can, let them do it, my Lord. No matter how much trouble there is, find it out again. Prepare a long stick or something, anytime.